#include <iostream>
#include <cstdint>

using namespace std;

int main()
{
	cin.tie(nullptr);
	ios::sync_with_stdio(false);

	uint16_t X1, Y1, X2, Y2, X3;
	cin >> X1 >> Y1 >> X2 >> Y2 >> X3;

	if (Y1 == Y2) cout << "Yes\n";
	else cout << "No\n";

	return 0;
}