#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < n; ++i)
typedef long long ll;
using namespace std;

int main() {
    cin.tie(0)->sync_with_stdio(0);

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

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

    return 0;
}