#include<bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i=0; i<(n); ++i)
using ll = long long;

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