#include <bits/stdc++.h>
using namespace std;
using lint = long long;
template<class T = int> using V = vector<T>;
template<class T = int> using VV = V< V<T> >;

int main() {
  cin.tie(nullptr); ios::sync_with_stdio(false);
  lint a, b, c, d; cin >> a >> b >> c >> d;
  while (a) {
    lint q = c / a;
    swap(c -= q * a, a);
    swap(d -= q * b, b);
  }
  b = abs(b);
  int n; cin >> n;
  set< pair<lint, lint> > se;
  while (n--) {
    lint x, y; cin >> x >> y;
    lint q = x / c;
    x -= q * c;
    y -= q * d;
    se.emplace(x, b ? (y % b + b) % b : y);
  }
  cout << se.size() << '\n';
}