static long power ( long x , int n ) {
  if ( n == 0 ) return 1 ;
  if ( n % 2 == 0 ) {
    long e = power ( x , n / 2 ) ;
    return ( e * e ) ;
  }
  long e = ( x * power ( x , n - 1 ) ) ;
  return e ;
}

static long power ( long x , int n ) { if ( n == 0 ) return 1 ; if ( n % 2 == 0 ) { long e = power ( x , n / 2 ) ; return ( e * e ) ; } long e = ( x * power ( x , n - 1 ) ) ; return e ; }
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