#include <bits/stdc++.h>
#define rep(i, n) for (ll i = 0; i < n; ++i)
typedef long long ll;
using namespace std;
const int INF = 1e9;

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

    return 0;
}