public static long power ( long a , long b , long c ) {
  long ans = 1 ;
  while ( b != 0 ) {
    if ( b % 2 == 1 ) {
      ans = ans * a ;
      ans %= c ;
    }
    a = a * a ;
    a %= c ;
    b /= 2 ;
  }
  return ans ;
}

public static long power ( long a , long b , long c ) { long ans = 1 ; while ( b != 0 ) { if ( b % 2 == 1 ) { ans = ans * a ; ans %= c ; } a = a * a ; a %= c ; b /= 2 ; } return ans ; }
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