#include <bits/stdc++.h>

int ri() {
	int n;
	scanf("%d", &n);
	return n;
}

int main() {
	int a[4];
	for (auto &i : a) i = ri();
	puts(a[0] < a[1] && a[2] > a[3] ? "YES" : "NO");
	return 0;
}