#include <bits/stdc++.h>
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
using namespace std;
int main() {
  cin.tie(0); cout.tie(0);
  ios::sync_with_stdio(false);
  int X1, Y1, X2, Y2, X3;
  cin >> X1 >> Y1 >> X2 >> Y2 >> X3;
  cout << (abs(Y1) == abs(Y2) ? "Yes\n" : "No\n");
  return 0;
}