static int findX ( int a [ ] , int n ) {
  Arrays . sort ( a ) ;
  int x = a [ 0 ] * a [ n - 1 ] ;
  Vector < Integer > vec = new Vector < Integer > ( ) ;
  for ( int i = 2 ;
  i * i <= x ;
  i ++ ) {
    if ( n % i == 0 ) {
      vec . add ( i ) ;
      if ( ( n / i ) != i ) vec . add ( n / i ) ;
    }
  }
  if ( vec . size ( ) == n ) {
    int i = 0 ;
    for ( int it : vec ) {
      if ( a [ i ++ ] != it ) return - 1 ;
    }
  }
  return x ;
}

static int findX ( int a [ ] , int n ) { Arrays . sort ( a ) ; int x = a [ 0 ] * a [ n - 1 ] ; Vector < Integer > vec = new Vector < Integer > ( ) ; for ( int i = 2 ; i * i <= x ; i ++ ) { if ( n % i == 0 ) { vec . add ( i ) ; if ( ( n / i ) != i ) vec . add ( n / i ) ; } } if ( vec . size ( ) == n ) { int i = 0 ; for ( int it : vec ) { if ( a [ i ++ ] != it ) return - 1 ; } } return x ; }
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