#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(int)(n);i++)
using namespace std;
using ll = long long ;
using P = pair<int,int> ;
using pll = pair<long long,long long>;
constexpr int INF = 1e9;
constexpr long long LINF = 1e17;
constexpr int MOD = 1000000007;
constexpr double PI = 3.14159265358979323846;

int main(){
    vector<int> a(4);
    rep(i,4) cin >> a[i];
    if(a[0]<a[1]&&a[2]>a[3]) cout << "YES" << endl;
    else cout << "NO" << endl;
    return 0;
}