#include<bits/stdc++.h>

using namespace std;

int main(){
	int x1,y1,x2,y2,x3;
	cin >> x1 >> y1 >> x2 >> y2 >> x3;
	if(y1 == y2) cout << "Yes" << endl;
	else cout << "No" << endl;
	return 0;
}