#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i = 0; i < (n);i++)
#define sz(x) int(x.size())
typedef long long ll;
typedef long double ld;
typedef pair<int,int> P;

int main() {
  int a, b, c, d;
  cin >> a >> b >> c >> d;
  if (a < b && c > d) {
    cout << "YES" << endl;
  } else {
    cout << "NO" << endl;
  }
  return 0;
}