#include <bits/stdc++.h>
using namespace std;
int main(){
  int X1, Y1, X2, Y2, X3;
  cin >> X1 >> Y1 >> X2 >> Y2 >> X2;
  if (Y1 == Y2){
    cout << "Yes" << endl;
  } else {
    cout << "No" << endl;
  }
}