#include <bits/stdc++.h>
#define PI 3.14159265359
using namespace std;

int main() {
	vector<int> v(4);
	for (int i = 0; i < 4; i++) {
		cin >> v.at(i);
	}

	bool b = false;
	if (v.at(0) < v.at(1)) {
		if (v.at(2) > v.at(3)) {
			b = true;
		}
	}

	cout << (b ? "YES" : "NO") << endl;
}