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

# define EPS 10E-10

int main(void){

int X,Y,N,i;
double r, dx;

while (1){
	scanf("%d %d %d %lf", &X, &Y, &N, &r);
	if (X==0&&Y==0&&N==0&&r==0) break;
	N*=12;
	r/=12;
	r+=100;
	r/=100;
	dx=X;	
	for (i=0;i<N;i++){
		dx*=r;
		dx-=Y;
		/*printf("%lf\n",dx);*/
		if (dx<EPS) break;
	}
	/*printf("%lf\n",dx);*/
	if (dx<EPS) printf("YES\n");
	else printf("NO\n");
}

return 0;
}