/**
 *   @FileName	a.cpp
 *   @Author	kanpurin
 *   @Created	2020.07.10 21:20:54
**/

#include "bits/stdc++.h" 
using namespace std; 
typedef long long ll;

int main() {
    int a, b, c, d;cin >> a >> b >> c >> d;
    if (a < b && c > d) {
        cout << "YES" << endl;
    }
    else {
        cout << "NO" << endl;
    }
    return 0;
}