public static long pow ( long x , long n ) {
  long ans = 1 ;
  while ( n != 0 ) {
    if ( n % 2 == 1 ) ans *= x ;
    ans %= mod ;
    n /= 2 ;
    x *= x ;
    x %= mod ;
  }
  return ans % mod ;
}

public static long pow ( long x , long n ) { long ans = 1 ; while ( n != 0 ) { if ( n % 2 == 1 ) ans *= x ; ans %= mod ; n /= 2 ; x *= x ; x %= mod ; } return ans % mod ; }
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