#include <iostream>
#include <cstdlib>
#include <cstdio>
#include <string.h>

using namespace std;

int main()
{
	
	for(;;)
	{
		
		long long dlh, spl, rok;
		double urok;
		scanf("%lld%lld%lld%lf", &dlh, &spl, &rok, &urok);
		if (!dlh && !spl && !rok && !urok)
			break;

		urok /= 100;
		urok /= 12;
		urok +=1;
		double result = 1;
		for (int i = 0; i < rok; i++)
			result *= urok;

		dlh = dlh + result - (spl*(12*rok));

		if (dlh <= 0.00000001)
			printf("YES\n");
		else 
			printf("NO\n");

		
	}

	return 0;
}