#include <bits/stdc++.h>

using namespace std;

using ll = long long;

constexpr char newl = '\n';

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    array<int, 4> a;
    for (int i = 0; i < 4; i++) {
        cin >> a[i];
    }

    cout << ((a[0] < a[1] && a[2] > a[3]) ? "YES" : "NO") << newl;
    return 0;
}