#include <stdio.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <vector>
#include <queue>

using namespace std;


int main(int argc, char *argv[]) {
	
	argc = argc;
	argv = argv;
	
	int X = 0, Y = 0, N = 0;
	float r = 0.0f;
	
	while (true)
	{
		scanf("%d %d %d %f", &X, &Y, &N, &r);
		if (X == 0 && Y == 0 &&  N== 0 && r == 0.0f)
			break;
		
		bool valid = false;
		float x1 = (float)X;
		float y = (float)Y;
		r /= 100.0;
		r /= 12.0f;
		for ( int  i = 0; i < ( N * 12 ); i++ )
		{
			x1 = x1 + ( x1 * r ) - y;
			
			if ( (float)X < x1 )
				break;
			
			if ( x1 <= 0.0 )
			{
				valid = true;
				break;
			}
		}
		
		
		printf( valid ? "YES\n" : "NO\n" );
	}
	
	return 0;
}