#include <iostream>
#include <vector>
#include <algorithm>
#include <string>

using namespace std;

int main() {

	int a, b, c, d;
	cin >> a >> b >> c >> d;

	if (a < b) {
		if (c > d) {
			cout << "YES" << endl;
			return 0;
		}
	}

	cout << "NO" << endl;

	return 0;

}