#include <iostream>
#include <map>
#include <vector>

using namespace std;

int main(int argc, char *argv[]) {

	while (1) {
		unsigned cityCnt, pathCnt, baseCnt;
		double perc;
		cin >> cityCnt;
		cin >> pathCnt;
		cin >> baseCnt;
		cin >> perc;
		if ((cityCnt + pathCnt + baseCnt +perc) == 0) break;
		perc = 1.0+(perc/12)/100.0;
		double value = cityCnt;
		for (unsigned i = 0; i<baseCnt*12 && value>0 ; ++i) {
			value *= perc;
			value -= pathCnt;
		}
		if (value <=0)
			cout << "YES";
		else
			cout << "NO";
		cout << endl;
	}

	return 0;
}