#include<iostream>
#include<vector>
long long x1, y1, x2, y2, n;
using namespace std;
int main(){
    cin >> x1 >> y1;
    cin >> x2 >> y2;
    cin >> n;
    int k = 0;
    while (n--){
        long long a, b, c;
        cin >> a >> b >> c;
        if ((a*x1 + b*y1 + c > 0 && a*x2 + b*y2 + c < 0) || (a*x1 + b*y1 + c < 0 && a*x2 + b*y2 + c > 0))
            k++;
    }
    cout << k;
}