#include <bits/stdc++.h>
typedef long long ll;
using namespace std;
#define rep(i,a,n) for (int i = a; i < (n); i++)
template<typename T> inline bool chmax(T & a, T b) { return ((a < b) ? (a = b, true) : (false)); }
template<typename T> inline bool chmin(T & a, T b) { return ((a > b) ? (a = b, true) : (false)); }

int main() {
	int x[3], y[2];
	cin >> x[0];
	rep(i, 0, 2) cin >> y[i] >> x[i + 1];
	if (y[0] == y[1])
		cout << "Yes\n";
	else
		cout << "No\n";
}