#include <bits/stdc++.h>   using namespace std;   int main() {     ios::sync_with_stdio(false);     pair<int, int> home, uni;     cin >> home.first >> home.second >> uni.first >> uni.second;     int count;     cin >> count;     int solution = 0;     int64_t a, b, c;     for (int i = 0; i < count; i++) {       cin >> a >> b >> c;       bool h_p = a * home.first + b * home.second + c > 0;       bool u_p = a * uni.first + b * uni.second + c > 0;       if ((h_p && !u_p) || (!h_p && u_p)) {         solution++;       }     }     cout << solution << endl;     return 0;   }   