#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int n,a,b,q;
    cin >> n >> a >> b >> q;
    while(q--)
    {
        int x, y, z;
        cin >> x >> y >> z;
    }
    cout << "No\n" << "Yes\n";
    return 0;
}