#include<bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i=0; i<(n); i++)

int main() {
	int a[4]; rep(i, 4) cin >> a[i];
	if (a[0]<a[1] && a[2]>a[3]) cout << "YES" << endl;
	else cout << "NO" << endl;
	return 0;
}