#include <iostream>
#include<cmath>
using namespace std;
int main()
{
	long long num1, num2, num3, num4, res1, res2;
	cin>>num1>>num2>>num3>>num4;
res1 = num2 * log(num1);
res2 = num4 * log(num3);
if(res1 > res2){
	cout<<"YES";
}else{
	cout<<"NO";
}

	return 0;
}