typedef long long ll;
typedef long double ld;
#include <bits/stdc++.h>
using namespace std;

int main() {
    vector<ll> a(4);
    for (int i = 0; i < 4; i++) {
        std::cin >> a[i];
    }
    if(a[0]<a[1]&&a[2]>a[3]){
        std::cout << "YES" << std::endl;
    }else{
        std::cout << "NO" << std::endl;
    }
}