public static long pow ( long a , long n ) {
  if ( n == 0 ) return ( 1 ) ;
  long ls ;
  ls = pow ( a , n / 2 ) ;
  ls = ls * ls % 1000000007 ;
  if ( n % 2 == 0 ) {
    return ls ;
  }
  else {
    return ls * a % 1000000007 ;
  }
}

public static long pow ( long a , long n ) { if ( n == 0 ) return ( 1 ) ; long ls ; ls = pow ( a , n / 2 ) ; ls = ls * ls % 1000000007 ; if ( n % 2 == 0 ) { return ls ; } else { return ls * a % 1000000007 ; } }
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