#include "bits/stdc++.h"

using namespace std;

signed main() {

	long long h, w, n, k;
	cin >> h >> w >> n >> k;

	bool loseFlg = false;
	if (k == n) {
		if ((h*w) % n == 0) {
			loseFlg = true;
		}
	}
	else {
		if (((h*w) % n) == k) {
			loseFlg = true;
		}

	}
	string ans;
	ans = loseFlg ? "YES" : "NO";
	cout << ans << endl;

	return 0;
}