#define _USE_MATH_DEFINES
#include<stdio.h>
#include<string>
#include<iostream>
#include<cctype>
#include<cstdio>
#include<vector>
#include<stack>
#include <algorithm>
#include<math.h>
#include<set>
#include<map>
#include<iomanip>
//#include<bits/stdc++.h>


using namespace std;




int main() {
  
	long long int a,b,n,k;
	cin>>a>>b>>n>>k;
	long long int x=a*b;
	x%=n;
	if(x==k||(n==k&&x==0))cout<<"YES"<<endl;
	else cout<<"NO"<<endl;

    return 0;
}