#include<iostream>
#include<string>
#include<algorithm>
#include<cctype>
#include<set>
#include<bitset>
#include<math.h>
#include<map>
#include<queue>
#include<iomanip>
using namespace std;

int main(){
    int a, b, c, d;
    cin >> a >> b >> c >> d;
    if (a<b && c>d) cout << "YES" << endl;
    else cout << "NO" << endl;
}