#include <bits/stdc++.h>
#define For(i, a, n) for(ll i = a; i < (n); i++)
#define rep(i, n) for(ll i = 0; i < (n); i++)
#define dep(i, n) for(ll i = n - 1; i >= 0; i--)
#define all(x) x.begin(), x.end()
#define maxs(a, b) (a = max(a, b))
#define mins(a, b) (a = min(a, b))
using namespace std;
using ll = long long;
using vi = vector<int>;
using vl = vector<long>;
using vll = vector<ll>;
using vii = vector<vi>;
using vvl = vector<vl>;
using vvll = vector<vll>;
const ll INF = 1LL << 60;
const double PI = acos(-1.0);
template <class T>
T vgcd(T m, T n){
	return gcd(m, n);
}
template <class T, class... Args>
T vgcd(T a, Args... args){
	return vgcd(a, vgcd(args...));
}

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