#include <iostream>
#include <vector>
#include <climits>
#include <algorithm>
#include <cmath>
#include <map>
#include <set>
#include <string>
#include <bitset>
#include <utility>
#include <numeric>
#include <queue>
#include <stack>

using ll = long long;
using namespace std;

constexpr int MOD = 1e9 + 7;
constexpr ll MOD_LL = ll(1e9 + 7);

int main(void) {
	int a1, a2, a3, a4;
	cin >> a1 >> a2 >> a3 >> a4;
	
	if( (a1 < a2) && (a3 > a4) ) cout << "YES" << endl;
	else cout << "NO" << endl;
	
	return 0;
}