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

int main() {
    vector<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;
    }
}