import sys
import math

def main():
    a, b, c, d = map(int, sys.stdin.readline().split())
    N = int(sys.stdin.readline())
    points = [tuple(map(int, sys.stdin.readline().split())) for _ in range(N)]
    
    determinant = a * d - b * c
    if determinant != 0:
        g = abs(determinant)
        groups = set()
        for x, y in points:
            s = (d * x - c * y) % g
            t = (-b * x + a * y) % g
            groups.add((s, t))
        print(len(groups))
    else:
        # Check if both vectors are zero vectors (but problem states they are not)
        # Since (a,b) and (c,d) are non-zero and parallel, compute based on (a,b)
        # Compute gcd of a and b
        g = math.gcd(a, b)
        if g == 0:
            g = math.gcd(c, d)
            a, b = c, d
        a_prime = a // g
        b_prime = b // g
        groups = set()
        for x, y in points:
            val = b_prime * x - a_prime * y
            groups.add(val)
        print(len(groups))
    
if __name__ == "__main__":
    main()