import java.util.Arrays;
import java.util.HashSet;
import java.util.Scanner;

class Main {
	public static void main(String[] args) {
		new Main().run();
	}

	void run() {

		Scanner sc = new Scanner(System.in);

		long a = sc.nextLong();
		long b = sc.nextLong();
		long c = sc.nextLong();
		long d = sc.nextLong();
		int N = sc.nextInt();
		HashSet<String> set = new HashSet<>();
		long det = a * d - b * c;
		det = Math.abs(det);
		if (det != 0) {
			for (int i = 0; i < N; ++i) {
				long x = sc.nextLong() % det;
				long y = sc.nextLong() % det;
				long s = ((d * x - c * y) % det + det) % det;
				long t = ((-b * x + a * y) % det + det) % det;
				set.add(s + ":" + t);
			}
		} else {
			if (a < 0) {
				a *= -1;
				b *= -1;
			}
			if (c < 0) {
				c *= -1;
				d *= -1;
			}
			long gcd = a != 0 ? gcd(a, c) : gcd(b, d);
			long div = a / gcd;
			a /= div;
			b /= div;
			for (int i = 0; i < N; ++i) {
				long x = sc.nextLong();
				long y = sc.nextLong();
				long s = x % a;
				long t = y - x / a * b;
				set.add(s + ":" + t);
			}
		}
		System.out.println(set.size());
	}

	long gcd(long a, long b) {
		if (a > b) {
			return gcd(b, a);
		}
		if (a == 0)
			return b;
		return gcd(a, b % a);
	}

	void tr(Object... objects) {
		System.out.println(Arrays.deepToString(objects));
	}
}