#include <cstdio>
#include <cstdlib>
#include <cmath>
#define EPS 1E-10

int main(int argc, char* argv[]){
	int pujcka, plat, roky;
	double urok;
	while(1){
		scanf("%d%d%d%lf", &pujcka, &plat, &roky, &urok);
		if(pujcka==0 && plat==0 && roky==0 && urok==0.0) break;
		urok = (urok / 100);
		double mu = urok / 12;
		double q = (1 + mu);
		int mesice = roky * 12;
		
		double hyp = (pujcka * (pow(q, mesice)));
		double splati = (plat * ((pow(q, mesice) - 1) / (mu)));
		if((hyp - splati) > EPS) printf("NO\n");
		else printf("YES\n");
	}
	return 0;
}