#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

int main(void) {
	long long h,w,n,k;
	cin >> h >> w >> n >> k;
	if(h*w%n == 0 && n == k)cout << "YES" << endl;
	else if(h*w%n == k)cout << "YES" << endl;
	else cout << "NO" << endl;
	return 0;
}