#include <iostream>
#include <vector>
using namespace std;

using ll = long long;
using VI = vector<int>;




int main()
{
	int n[4];
	for (int i = 0; i < 4; i++)
	{
		cin >> n[i];
	}

	if (n[0] < n[1] && n[2] > n[3])
	{
		cout << "YES\n";
	}
	else
	{
		cout << "NO\n";
	}
	return 0;

}