#include <algorithm>
#include <iostream>
#include <iomanip>
#include <map>
#include <numeric>
#include <set>
#include <sstream>
#include <string>
#include <vector>
#include <cmath>
using namespace std;

#define FOR(i,s,e) for (int i = int(s); i != int(e); i++)
#define FORIT(i,c) for (typeof((c).begin()) i = (c).begin(); i != (c).end(); i++)
#define ISEQ(c) (c).begin(), (c).end()

int main(){
	long long H,W,S,K;
	cin >> H >> W >> S >> K;
	long long masu = H * W;

	if (K == S) K = 0;
	if(masu%S == K) cout << "YES" << endl;
	else cout << "NO" << endl;
	return 0;
}