#include <iostream>
using namespace std;
int main(void){
    // Your code here!
    long long int H,W,N,K;
    cin>>H>>W>>N>>K;
    if(N==K){
        if((H*W)%N==0){cout<<"YES"<<endl;}
        else{cout<<"NO"<<endl;}
    }
    else{
        if((H*W)%N==K){cout<<"YES"<<endl;}
        else{cout<<"NO"<<endl;}
    }
    return 0;
}