static int product ( int a [ ] , int n ) {
  int ans = 1 ;
  int val = ( int ) Math . pow ( 2 , n - 1 ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    ans *= ( int ) Math . pow ( a [ i ] , val ) ;
  }
  return ans ;
}

static int product ( int a [ ] , int n ) { int ans = 1 ; int val = ( int ) Math . pow ( 2 , n - 1 ) ; for ( int i = 0 ; i < n ; i ++ ) { ans *= ( int ) Math . pow ( a [ i ] , val ) ; } return ans ; }
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