#include <iostream>
#include <cmath>
using namespace std;

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;
    return 0;
}