#include <stdlib.h>
#include <stdio.h>
#include <math.h>


int main(){
	
	int celkem, splatka, pocet_roku, pocet_splatek;
	double rocni_urok, mesicni_urok, spoc_mes_splatka, uroknapocspl;
	
	while(true){
		
		scanf("%d%d%d%lf", &celkem, &splatka, &pocet_roku, &rocni_urok);
		
		if (celkem == 0 && splatka == 0 && pocet_roku == 0 && rocni_urok == 0)
			break;
		
		pocet_splatek = pocet_roku * 12;
		
		//printf("celkem %d, splatka %d, pocet roku %d, rocni urok %f\n", celkem, splatka, pocet_roku, rocni_urok);
		
		if( rocni_urok == 0 ){
			if( celkem / pocet_splatek <= splatka ){
				printf("YES\n");
			}
			else{
				printf("NO\n");
			}
			continue;
		}
		
		rocni_urok = rocni_urok / 100; // prevod z procent
		mesicni_urok = rocni_urok / 12;
		
		mesicni_urok += 1; // napr 1.05 je 5% urok
		
		uroknapocspl = pow(mesicni_urok, pocet_splatek);
		
		spoc_mes_splatka = celkem * (uroknapocspl * ( (mesicni_urok - 1)/(uroknapocspl-1) ) );
		
		//printf("spocitana splatka%f ", spoc_mes_splatka);
		
		if( splatka >= spoc_mes_splatka )
			printf("YES\n");
		else
			printf("NO\n");
		
	}	
	
	return 0;
}