#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <iomanip>
#include <stack>
#include <algorithm>
#include <string>
#include <map>
#include <iterator>
#include <set>
#include <queue>
#include <bitset>
#include <cassert>

using namespace std;


int main() {

    int A1, A2, A3, A4;
    cin >> A1 >> A2 >> A3 >> A4;
    cout << ((A1 < A2 and A3 < A4) ? "YES" : "NO") << endl;
}