#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
#define FOR(i, a, b) for (int i = a; i < (b); i++)
#define RFOR(i, a, b) for (int i = a; i >= (b); i--)
#define range(a) a.begin(), a.end()
#define endl "\n"
#define Yes() cout << "Yes" << endl
#define No() cout << "No" << endl
#define pb push_back
int dx[4] = {-1, 0, 1, 0};
int dy[4] = {0, -1, 0, 1};
using P = pair<int, int>;
const long long INFL = LLONG_MAX;
const int INFI = INT_MAX;
template<class T>bool chmin(T &a, const T &b) { if(a > b) {a = b; return true; } else return false; }
template<class T>bool chmax(T &a, const T &b) { if(a < b) {a = b; return true; } else return false; }

int main(void){
	ios::sync_with_stdio(0);
	cin.tie(0);
	int X1, X2, Y1, Y2, X3;
	cin >> X1 >> Y1 >> X2 >> Y2 >> X3;
	if(Y1 == Y2){
		Yes();
	}else{
		No();
	}

	return 0;
}