<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>poa.txt
<TEXT>
                                                                 Exhibit 24


                             POWER OF ATTORNEY


     KNOW ALL PERSONS BY THESE PRESENTS that THE GOLDMAN SACHS GROUP, INC.
(the "Company") does hereby make, constitute and appoint each of Roger S.
Begelman, Yvette Kosic, Andrea Louro DeMar, John M. O'Rourke, Felicia J.
Rector, Michael T. Seeley, and Stephen Wong, (and any other employee of The
Goldman Sachs Group, Inc. or one of its affiliates designated in writing by
one of the attorneys-in-fact), acting individually, its true and lawful
attorney, to execute and deliver in its name and on its behalf whether the
Company is acting individually or as representative of others, any and all
filings required to be made by the Company under the Securities Exchange
Act of 1934, (as amended, the "Act"), with respect to securities which may
be deemed to be beneficially owned by the Company under the Act, giving and
granting unto each said attorney-in-fact power and authority to act in the
premises as fully and to all intents and purposes as the Company might or
could do if personally present by one of its authorized signatories, hereby
ratifying and confirming all that said attorney-in-fact shall lawfully do
or cause to be done by virtue hereof.

     THIS POWER OF ATTORNEY shall remain in full force and effect until
either revoked in writing by the undersigned or until such time as the
person or persons to whom power of attorney has been hereby granted
cease(s) to be an employee of The Goldman Sachs Group, Inc. or one of its
affiliates.

     IN WITNESS WHEREOF, the undersigned has duly subscribed these presents
as of May 23, 2006.


THE GOLDMAN SACHS GROUP, INC.


By:/s/ Gregory K. Palm
   ------------------------------------
Name:  Gregory K. Palm
Title: Executive Vice President and General Counsel

<PAGE>

                             POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS that GOLDMAN, SACHS & CO. (the
"Company") does hereby make, constitute and appoint each of Roger S.
Begelman, Yvette Kosic, Andrea Louro DeMar, John M. O'Rourke, Felicia J.
Rector, Michael T. Seeley, and Stephen Wong, (and any other employee of The
Goldman Sachs Group, Inc. or one of its affiliates designated in writing by
one of the attorneys-in-fact), acting individually, its true and lawful
attorney, to execute and deliver in its name and on its behalf whether the
Company is acting individually or as representative of others, any and all
filings required to be made by the Company under the Securities Exchange
Act of 1934, (as amended, the "Act"), with respect to securities which may
be deemed to be beneficially owned by the Company under the Act, giving and
granting unto each said attorney-in-fact power and authority to act in the
premises as fully and to all intents and purposes as the Company might or
could do if personally present by one of its authorized signatories, hereby
ratifying and confirming all that said attorney-in-fact shall lawfully do
or cause to be done by virtue hereof.

     THIS POWER OF ATTORNEY shall remain in full force and effect until
either revoked in writing by the undersigned or until such time as the
person or persons to whom power of attorney has been hereby granted
cease(s) to be an employee of The Goldman Sachs Group, Inc. or one of its
affiliates.

     IN WITNESS WHEREOF, the undersigned has duly subscribed these presents
as of June 26, 2006.


GOLDMAN, SACHS & CO.


By:/s/ Gregory K. Palm
   ------------------------------------
Name:  Gregory K. Palm
Title: Managing Director

<PAGE>

                             POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS that GS CAPITAL PARTNERS V GmbH &
CO. KG (the "Company") does hereby make, constitute and appoint each of
Roger S. Begelman, Yvette Kosic, Andrea Louro DeMar, John M. O'Rourke,
Felicia J. Rector, Michael T. Seeley, and Stephen Wong (and any other
employee of The Goldman Sachs Group, Inc. or one of its affiliates
designated in writing by one of the attorneys-in-fact), acting
individually, its true and lawful attorney-in-fact, to execute and deliver
in its name and on its behalf whether the Company is acting individually or
as representative of others, any and all filings required to be made by the
Company under the Securities Exchange Act of 1934, (as amended, the "Act"),
with respect to securities which may be deemed to be beneficially owned by
the Company under the Act, giving and granting unto each said
attorney-in-fact power and authority to act in the premises as fully and to
all intents and purposes as the Company might or could do if personally
present by one of its authorized signatories, hereby ratifying and
confirming all that said attorney-in-fact shall lawfully do or cause to be
done by virtue hereof.

     THIS POWER OF ATTORNEY shall remain in full force and effect until
either revoked in writing by the undersigned or until such time as the
person or persons to whom power of attorney has been hereby granted
cease(s) to be an employee of The Goldman Sachs Group, Inc. or one of its
affiliates.

     IN WITNESS WHEREOF, the undersigned has duly subscribed these presents
as of April 12, 2006.


GS CAPITAL PARTNERS V GmbH & CO. KG
By:  GS Advisors V, L.L.C.,
     its Managing Limited Partner

By:     /s/ Adrian M. Jones
   ------------------------------------
    Name:   Adrian M. Jones
    Title:  Managing Director

<PAGE>

                             POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS that GSCP V ADVISORS, L.L.C. (the
"Company") does hereby make, constitute and appoint each of Roger S.
Begelman, Yvette Kosic, Andrea Louro DeMar, John M. O'Rourke, Felicia J.
Rector, Michael T. Seeley, and Stephen Wong (and any other employee of The
Goldman Sachs Group, Inc. or one of its affiliates designated in writing by
one of the attorneys-in-fact), acting individually, its true and lawful
attorney-in-fact, to execute and deliver in its name and on its behalf
whether the Company is acting individually or as representative of others,
any and all filings required to be made by the Company under the Securities
Exchange Act of 1934, (as amended, the "Act"), with respect to securities
which may be deemed to be beneficially owned by the Company under the Act,
giving and granting unto each said attorney-in-fact power and authority to
act in the premises as fully and to all intents and purposes as the Company
might or could do if personally present by one of its authorized
signatories, hereby ratifying and confirming all that said attorney-in-fact
shall lawfully do or cause to be done by virtue hereof.

     THIS POWER OF ATTORNEY shall remain in full force and effect until
either revoked in writing by the undersigned or until such time as the
person or persons to whom power of attorney has been hereby granted
cease(s) to be an employee of The Goldman Sachs Group, Inc. or one of its
affiliates.

     IN WITNESS WHEREOF, the undersigned has duly subscribed these presents
as of April 12, 2006.


GSCP V ADVISORS, L.L.C.


By:     /s/ Adrian M. Jones
   ------------------------------
Name:   Adrian M. Jones
Title:  Managing Director

<PAGE>

                             POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS that GSCP V OFFSHORE ADVISORS,
L.L.C. (the "Company") does hereby make, constitute and appoint each of
Roger S. Begelman, Yvette Kosic, Andrea Louro DeMar, John M. O'Rourke,
Felicia J. Rector, Michael T. Seeley, and Stephen Wong (and any other
employee of The Goldman Sachs Group, Inc. or one of its affiliates
designated in writing by one of the attorneys-in-fact), acting
individually, its true and lawful attorney-in-fact, to execute and deliver
in its name and on its behalf whether the Company is acting individually or
as representative of others, any and all filings required to be made by the
Company under the Securities Exchange Act of 1934, (as amended, the "Act"),
with respect to securities which may be deemed to be beneficially owned by
the Company under the Act, giving and granting unto each said
attorney-in-fact power and authority to act in the premises as fully and to
all intents and purposes as the Company might or could do if personally
present by one of its authorized signatories, hereby ratifying and
confirming all that said attorney-in-fact shall lawfully do or cause to be
done by virtue hereof.

     THIS POWER OF ATTORNEY shall remain in full force and effect until
either revoked in writing by the undersigned or until such time as the
person or persons to whom power of attorney has been hereby granted
cease(s) to be an employee of The Goldman Sachs Group, Inc. or one of its
affiliates.

     IN WITNESS WHEREOF, the undersigned has duly subscribed these presents
as of April 12, 2006.


GSCP V OFFSHORE ADVISORS, L.L.C.


By:     /s/ Adrian M. Jones
   -----------------------------
Name:   Adrian M. Jones
Title:  Managing Director

<PAGE>

                             POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS that GS ADVISORS V, L.L.C. (the
"Company") does hereby make, constitute and appoint each of Roger S.
Begelman, Yvette Kosic, Andrea Louro DeMar, John M. O'Rourke, Felicia J.
Rector, Michael T. Seeley, and Stephen Wong (and any other employee of The
Goldman Sachs Group, Inc. or one of its affiliates designated in writing by
one of the attorneys-in-fact), acting individually, its true and lawful
attorney-in-fact, to execute and deliver in its name and on its behalf
whether the Company is acting individually or as representative of others,
any and all filings required to be made by the Company under the Securities
Exchange Act of 1934, (as amended, the "Act"), with respect to securities
which may be deemed to be beneficially owned by the Company under the Act,
giving and granting unto each said attorney-in-fact power and authority to
act in the premises as fully and to all intents and purposes as the Company
might or could do if personally present by one of its authorized
signatories, hereby ratifying and confirming all that said attorney-in-fact
shall lawfully do or cause to be done by virtue hereof.

     THIS POWER OF ATTORNEY shall remain in full force and effect until
either revoked in writing by the undersigned or until such time as the
person or persons to whom power of attorney has been hereby granted
cease(s) to be an employee of The Goldman Sachs Group, Inc. or one of its
affiliates.

     IN WITNESS WHEREOF, the undersigned has duly subscribed these presents
as of April 12, 2006.


GS ADVISORS V, L.L.C.


By:     /s/ Adrian M. Jones
   ------------------------------
Name:   Adrian M. Jones
Title:  Managing Director

<PAGE>

                             POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS that GOLDMAN, SACHS MANAGEMENT GP
GmbH (the "Company") does hereby make, constitute and appoint each of Roger
S. Begelman, Yvette Kosic, John M. O'Rourke, Felicia J. Rector, Michael T.
Seeley, and Stephen Wong (and any other employee of The Goldman Sachs
Group, Inc. or one of its affiliates designated in writing by one of the
attorneys-in-fact), acting individually, its true and lawful
attorney-in-fact, to execute and deliver in its name and on its behalf
whether the Company is acting individually or as representative of others,
any and all filings required to be made by the Company under the Securities
Exchange Act of 1934, (as amended, the "Act"), with respect to securities
which may be deemed to be beneficially owned by the Company under the Act,
giving and granting unto each said attorney-in-fact power and authority to
act in the premises as fully and to all intents and purposes as the Company
might or could do if personally present by one of its authorized
signatories, hereby ratifying and confirming all that said attorney-in-fact
shall lawfully do or cause to be done by virtue hereof.

     THIS POWER OF ATTORNEY shall remain in full force and effect until
either revoked in writing by the undersigned or until such time as the
person or persons to whom power of attorney has been hereby granted
cease(s) to be an employee of The Goldman Sachs Group, Inc. or one of its
affiliates.

     IN WITNESS WHEREOF, the undersigned has duly subscribed these presents
as of November 21, 2005.


GOLDMAN, SACHS MANAGEMENT GP GmbH


By:     /s/ John E. Bowman
   ------------------------------
Name:   John E. Bowman
Title:  Managing Director

<PAGE>

                             POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS that GS CAPITAL PARTNERS V FUND,
L.P. (the "Company") does hereby make, constitute and appoint each of Roger
S. Begelman, Yvette Kosic, Andrea Louro DeMar, John M. O'Rourke, Felicia J.
Rector, Michael T. Seeley, and Stephen Wong (and any other employee of The
Goldman Sachs Group, Inc. or one of its affiliates designated in writing by
one of the attorneys-in-fact), acting individually, its true and lawful
attorney-in-fact, to execute and deliver in its name and on its behalf
whether the Company is acting individually or as representative of others,
any and all filings required to be made by the Company under the Securities
Exchange Act of 1934, (as amended, the "Act"), with respect to securities
which may be deemed to be beneficially owned by the Company under the Act,
giving and granting unto each said attorney-in-fact power and authority to
act in the premises as fully and to all intents and purposes as the Company
might or could do if personally present by one of its authorized
signatories, hereby ratifying and confirming all that said attorney-in-fact
shall lawfully do or cause to be done by virtue hereof.

     THIS POWER OF ATTORNEY shall remain in full force and effect until
either revoked in writing by the undersigned or until such time as the
person or persons to whom power of attorney has been hereby granted
cease(s) to be an employee of The Goldman Sachs Group, Inc. or one of its
affiliates.

     IN WITNESS WHEREOF, the undersigned has duly subscribed these presents
as of April 12, 2006.


GS CAPITAL PARTNERS V FUND, L.P.
By:  GSCP V Advisors, L.L.C.,
     its General Partner

By:     /s/ Adrian M. Jones
   -----------------------------------
    Name:   Adrian M. Jones
    Title:  Managing Director

<PAGE>

                             POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS that GS CAPITAL PARTNERS V OFFSHORE
FUND, L.P. (the "Company") does hereby make, constitute and appoint each of
Roger S. Begelman, Yvette Kosic, Andrea Louro DeMar, John M. O'Rourke,
Felicia J. Rector, Michael T. Seeley, and Stephen Wong (and any other
employee of The Goldman Sachs Group, Inc. or one of its affiliates
designated in writing by one of the attorneys-in-fact), acting
individually, its true and lawful attorney-in-fact, to execute and deliver
in its name and on its behalf whether the Company is acting individually or
as representative of others, any and all filings required to be made by the
Company under the Securities Exchange Act of 1934, (as amended, the "Act"),
with respect to securities which may be deemed to be beneficially owned by
the Company under the Act, giving and granting unto each said
attorney-in-fact power and authority to act in the premises as fully and to
all intents and purposes as the Company might or could do if personally
present by one of its authorized signatories, hereby ratifying and
confirming all that said attorney-in-fact shall lawfully do or cause to be
done by virtue hereof.

     THIS POWER OF ATTORNEY shall remain in full force and effect until
either revoked in writing by the undersigned or until such time as the
person or persons to whom power of attorney has been hereby granted
cease(s) to be an employee of The Goldman Sachs Group, Inc. or one of its
affiliates.

     IN WITNESS WHEREOF, the undersigned has duly subscribed these presents
as of April 12, 2006.


GS CAPITAL PARTNERS V OFFSHORE FUND, L.P.
By:   GSCP V Offshore Advisors, L.L.C.,
      its General Partner

By:     /s/ Adrian M. Jones
   ----------------------------------
    Name:   Adrian M. Jones
    Title:  Managing Director

</TEXT>
</DOCUMENT>
