#include <iostream>
#include <cassert>
#include <vector>

using namespace std;

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

  int x1, y1, x2, y2, x3; cin >> x1 >> y1 >> x2 >> y2 >> x3;

  cout << (y1 == y2? "Yes": "No") << endl;
  return 0;
}