#include <iostream> #include <vector> #include <iomanip> #include <algorithm> #include <map> #include <cmath> #include <bitset> #include <string> #include <queue> #include <stack> #include <set> #include <tuple> #include <atcoder/all> #include <sstream> // std::stringstream #include <regex> #include <fstream> using namespace atcoder; using mint = modint998244353; //using mint = modint1000000007; using namespace std; using ll = long long; static const double pi = 3.141592653589793; const int INF = (1 << 29); const ll mod = 998244353; // ifstream ifs(""); template<class T> void print(T& a){cout<<a<<'\n';} int main(){ int x1,y1,x2,y2,x3; cin >> x1 >> y1 >> x2 >> y2 >> x3; if(abs(y1)==abs(y2)) cout << "Yes" << endl; else cout << "No" << endl; }