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

int main()
{
    while(1)
    {
	int x, y, n;
	long double r;
	
	scanf("%d", &x);
	
	if(!(x))
	{
	    break;
	}
	
	scanf("%d%d%Lf", &y, &n, &r);
	
	long double xx = x, yy = y;
	long double debt = xx;
	r /= 12.0;
	r /= 100.0;
	r += 1.0;
	
	n *= 12;
	
	int solved = 0;
	for(int i = 0; i < n; i++)
	{
	    debt *= r;
	    debt -= yy;
	    
	    if(debt > xx)
	    {
		solved = 1;
		printf("NO\n");
		break;
	    }
	    
	    if(debt <= 0.0)
	    {
		solved = 1;
		printf("YES\n");
		break;
	    }
	}
	    
	if(!(solved))
	{
	    printf("NO\n");
	}
    }
    
    return 0;
}