#include<iostream>
#include<string>
#include<vector>
#include<algorithm>
#include<map>
#define all(x) x.begin(),x.end()
#define pb push_back
#define ll long long
using namespace std;
int main() {
	double a,b,c,d;
	cin >> a>>b>>c>>d;
	if (a<b and c>d) cout << "YES" << endl;
	else cout << "NO" << endl;
	return 0;
}