#include <iostream>
#include <cstdio>
#include <algorithm>
#include <vector>
#include <string>
#include <cctype>

using namespace std;

typedef long double LD;

int main(){
    int  X,Y,N;
    LD r;
    while(true){
        scanf("%d %d %d %Lf",&X,&Y,&N,&r);
        if (X == 0) break;
        r/=100;
        LD debt = X;
        for(int i=0;i<12*N;i++){
            debt += debt*(r/12.0);
   
            debt -= Y;
            if (debt < 0) break;
//            printf("%Lf\n",debt);

        }
        if (debt < 0) printf("YES\n");
        else printf("NO\n");
    }
}