#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */  
    int c1;
    int c2;
    int h1;
    int h2;
    cin >> c1 >> c2 >> h1 >> h2;
    int low = max(c1, c2);
    int high = min (h1, h2);
    if (low <= high) {
        cout << "YES" << endl;
    } else {
        cout << "NO" << endl;
    }
    return 0;
}