#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
template <class T = ll>
using vc = vector<T>;
template <class T = ll>
using vvc = vc<vc<T>>;
void solve();
int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(20);
    ll t = 1;
    // cin >> t;
    for (int i = 1; i <= t; i++) solve();
    return 0;
}
#define rep(i, a, b) for (ll i = (a); i < (b); i++)
// ll dy[8] = {0, 1, 1, 1, 0, -1, -1, -1}, dx[8] = {1, 1, 0, -1, -1, -1, 0, 1};
ll dy[4] = {0, 1, 0, -1}, dx[4] = {1, 0, -1, 0};

void solve() {
    ll x1, y1, x2, y2, x3;
    cin >> x1 >> y1 >> x2 >> y2 >> x3;
    cout << (y1 == y2 ? "Yes" : "No") << endl;
}