#include <stdio.h>
#include <stdlib.h>
	
int main(){
	long double x, stareX=0;
	long long int y;
	int n;
	float r;
	long long int i;
	long long int pocetMesiacov;
	int vysl = 0;

	while(1){
		scanf("%Lf %Ld %d %f", &x, &y, &n, &r);

		if(x == 0 && y == 0 && n == 0 && r == 0){
			break;
		}
		pocetMesiacov = n * 12;
		stareX = x;
		vysl = 0;
		for(i = 0; i<pocetMesiacov; i++){
			x = ((x * (r / 12.0f)) / 100.0f) + (x - y);
			if(x <= 0){
				break;
			}
			else if(stareX < x){
				vysl = 1;
				break;
			}
			stareX = x;
		}
		if(x <= 0 && vysl == 0){
			printf("YES\n");
		}
		else{
			printf("NO\n");
		}
	}
	
	return 0;
}