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

int main(int argc, char * argv[]){
long int Y;
double long X;
double r, con = 1e-10;
int i,  pay;

scanf("%Lf%d%ld%lf",&X, &pay, &Y,  &r);
while(pay != 0){
r /= 1200;
for(i=0; i < Y*12; i++){
	X *= (r+1);
	X -= pay;
	
	
	if(X < con)
	break;
	}

if(X < con){
		printf("YES\n");	
	} else {
		printf("NO\n");
		}
scanf("%Lf%d%ld%lf",&X, &pay, &Y,  &r);
}

return (0);
}