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

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