#include <bits/stdc++.h> using namespace std;

int main() { int q, w, e, a, b, n; cin >> a >> b; cin >> n; int s = a + b; for (int i = 1; i <= n; i++) { cin >> q >> w >> e; if (q + w + e < s) { cout << "No"; return 0; } } cout << "Yes"; return 0; }