#include<bits/stdc++.h>
using namespace std;
int main(){
  long a,b,c,d;cin>>a>>b>>c>>d;
  if(a*b%c==d){
      cout<<"YES"<<endl;
  }else if(a*b%c==0&&c==d){
      cout<<"YES"<<endl;
  }else{
      cout<<"NO"<<endl;
  }
}