static Vector < Integer > PrimeFactors ( int n ) {
  Vector < Integer > v = new Vector < Integer > ( ) ;
  int x = n ;
  for ( int i = 2 ;
  i * i <= n ;
  i ++ ) {
    if ( x % i == 0 ) {
      v . add ( i ) ;
      while ( x % i == 0 ) x /= i ;
    }
  }
  if ( x > 1 ) v . add ( x ) ;
  return v ;
}

static Vector < Integer > PrimeFactors ( int n ) { Vector < Integer > v = new Vector < Integer > ( ) ; int x = n ; for ( int i = 2 ; i * i <= n ; i ++ ) { if ( x % i == 0 ) { v . add ( i ) ; while ( x % i == 0 ) x /= i ; } } if ( x > 1 ) v . add ( x ) ; return v ; }
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