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

int main(){
   ios::sync_with_stdio(false);
   cin.tie(nullptr);
   
   int x1,y1,x2,y2,x3;
   cin >> x1 >> y1 >> x2 >> y2 >> x3;
   if(abs(y1)==abs(y2)) cout << "Yes" << endl;
   else cout << "No" << endl;

}