static int power ( int x , int y ) {
  if ( y == 0 ) return 1 ;
  else if ( y % 2 == 0 ) return power ( x , y / 2 ) * power ( x , y / 2 ) ;
  else return x * power ( x , y / 2 ) * power ( x , y / 2 ) ;
}

static int power ( int x , int y ) { if ( y == 0 ) return 1 ; else if ( y % 2 == 0 ) return power ( x , y / 2 ) * power ( x , y / 2 ) ; else return x * power ( x , y / 2 ) * power ( x , y / 2 ) ; }
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