#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, s, e) for (int i = (int)(s); i < (int)(e); ++i)
#define all(a) (a).begin(),(a).end()

int main() {
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);
    
    int A, B, C, D;
    cin >> A >> B >> C >> D;
    if (A < B && C > D) cout << "YES\n";
    else cout << "NO\n";
}