#include <stdio.h>

int main(void)
{
	long x,y;
	int n;
	double r;

	scanf("%ld %ld %d %lf", &x, &y, &n, &r);

	while ( x != 0 && y != 0 && n != 0 && r != 0 )
	{
		int i;
		double p = x;

		for (i = 0; i < n; i ++)		
		{
			p = p + ((p/100) * (r + r/12));
		}
		
		long t = y * 12 *n;

		if ( t >= p )
			printf("YES\n");
		else
			printf("NO\n");

		scanf("%ld %ld %d %lf", &x, &y, &n, &r);
	}

	return 0;

}