#include <bits/stdc++.h>

#define rep(X,N) for(ll X = 0LL; X < (N); X++)
#define ALL(V) (V).begin(),(V).end()

using namespace std;
typedef long long ll;

const double PI = 3.1415926535897932384626;
const ll MODN = 1000000007;
const ll MODN2 = 998244353;
const double EPS = 1e-10;

int main(){

    vector<int> a(4);

    rep(i, 4){
        cin >> a[i];
    }

    bool ans = a[0] < a[1] && a[2] > a[3];

    cout << (ans ? "YES" : "NO") << endl;

    return 0;
}