public static long pow ( long a , int b ) {
  if ( b == 1 ) return a ;
  if ( b % 2 == 0 ) {
    long d = pow ( a , b / 2 ) ;
    return d * d % MOD ;
  }
  return a * pow ( a , b - 1 ) % MOD ;
}

public static long pow ( long a , int b ) { if ( b == 1 ) return a ; if ( b % 2 == 0 ) { long d = pow ( a , b / 2 ) ; return d * d % MOD ; } return a * pow ( a , b - 1 ) % MOD ; }
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