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


int main(){
	
	int celkem, splatka, pocet_roku, pocet_splatek;
	long 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;
		}
		
		mesicni_urok  = rocni_urok / 1200; // prevod z procent
		mesicni_urok += 1;
		
		//uroknapocspl = pow(mesicni_urok, pocet_splatek);
		
		//spoc_mes_splatka = celkem * (uroknapocspl * ( (mesicni_urok - 1)/(uroknapocspl-1) ) );
		
		//printf("spocitana splatka%Lf ", spoc_mes_splatka);
		
		//if( splatka + 0.000001 >= spoc_mes_splatka )
		
		int i=1;
		
		while( i < pocet_splatek ){
			if (celkem <= 0)
				break;
			celkem *= mesicni_urok;
			celkem -= splatka;
			i++;
		}
		
		if( celkem <= 0 )
			printf("YES\n");
		else
			printf("NO\n");
		
	}	
	
	return 0;
}