static int GoodNumber ( int n ) {
  Vector < Integer > v = new Vector < Integer > ( PrimeFactors ( n ) ) ;
  int ans = 1 ;
  for ( int i = 0 ;
  i < v . size ( ) ;
  i ++ ) ans *= v . get ( i ) ;
  return ans ;
}

static int GoodNumber ( int n ) { Vector < Integer > v = new Vector < Integer > ( PrimeFactors ( n ) ) ; int ans = 1 ; for ( int i = 0 ; i < v . size ( ) ; i ++ ) ans *= v . get ( i ) ; return ans ; }
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