#include <cstdio>
#include <cstdlib>
#include <cmath>
#define EPS 1E-11

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);
if(urok==0.0 &&  pujcka > (mesice * plat)){
	printf("NO\n");
	continue;
} else if(urok == 0.0 && pujcka <= (mesice*plat)){
	printf("YES\n");
	continue;
}
		
		double hyp = (pujcka * (pow(q, mesice)));
		double splati = (plat * ((pow(q, mesice) - 1) / (mu)));

// printf("splati: %f \n hypoteka: %f\n", splati, hyp);

		if((hyp - splati) > EPS) printf("NO\n");
		else printf("YES\n");
	}
	return 0;
}