#include <iostream>
#include <algorithm>

int main() {
	int c1, c2, h1, h2;
	std::cin >> c1 >> c2 >> h1 >> h2;

	int low = std::max(c1, c2);
	int high = std::min(h1, h2);

	if (low <= high) {
		std::cout << "YES" << std::endl;
	} else {
		std::cout << "NO" << std::endl;
	}
}