#include <bits/stdc++.h>
using namespace std;
vector<string> vec_splitter(string s) {
  s += ',';
  vector<string> res;
  while (!s.empty()) {
    res.push_back(s.substr(0, s.find(',')));
    s = s.substr(s.find(',') + 1);
  }
  return res;
}
void debug_out(vector<string> __attribute__((unused)) args,
               __attribute__((unused)) int idx,
               __attribute__((unused)) int LINE_NUM) {
  cerr << endl;
}
template <typename Head, typename... Tail>
void debug_out(vector<string> args, int idx, int LINE_NUM, Head H, Tail... T) {
  if (idx > 0)
    cerr << ", ";
  else
    cerr << "Line(" << LINE_NUM << ") ";
  stringstream ss;
  ss << H;
  cerr << args[idx] << " = " << ss.str();
  debug_out(args, idx + 1, LINE_NUM, T...);
}
signed main() {
  long long x, y;
  long long p, q;
  cin >> x >> y >> p >> q;
  long long cnt = 0;
  long long n;
  cin >> n;
  for (long long i = 1; i <= n; i++) {
    long long a, b, c;
    cin >> a >> b >> c;
    if ((a * x + b * y + c > 0LL && a * p + b * q + c < 0LL) ||
        (a * x + b * y + c < 0LL && a * p + b * q + c > 0LL))
      cnt++;
  }
  cout << cnt << "\n";
}
