#include <set>
#include <cmath>
#include <tuple>
#include <vector>
#include <cassert>
#include <iostream>
using namespace std;
long long gcd(long long x, long long y) {
	if (y == 0) return x;
	return gcd(y, x % y);
}
int main() {
	cin.tie(0);
	ios_base::sync_with_stdio(false);
	long long A, B, C, D; int N;
	cin >> A >> B >> C >> D >> N;
	vector<long long> X(N), Y(N);
	for (int i = 0; i < N; ++i) {
		cin >> X[i] >> Y[i];
	}
	if (B * C - A * D != 0) {
		set<pair<long long, long long> > d;
		for (int i = 0; i < N; ++i) {
			long long xc = B * X[i] - A * Y[i];
			long long yc = D * X[i] - C * Y[i];
			bool xt = false, yt = false;
			if (xc < 0) xt = true, xc *= -1;
			xc %= abs(B * C - A * D);
			if (xt && xc != 0) xc = abs(B * C - A * D) - xc;
			if (yc < 0) yt = true, yc *= -1;
			yc %= abs(D * A - C * B);
			if (yt && yc != 0) yc = abs(D * A - C * B) - yc;
			d.insert(make_pair(xc, yc));
		}
		cout << d.size() << endl;
	}
	else {
		long long gx = gcd(A, C), gy = gcd(B, D);
		long long g = gcd(gx, gy);
		set<tuple<long long, long long, long long> > d;
		for (int i = 0; i < N; ++i) {
			d.insert(make_tuple(gy * X[i] - gx * Y[i], X[i] % g, Y[i] % g));
		}
		cout << d.size() << endl;
	}
	return 0;
}