a, b, c, d = map(int, input().split())
N = int(input())
points = [tuple(map(int, input().split())) for _ in range(N)]

D = a * d - b * c

if D == 0:
    components = {}
    for x, y in points:
        comp = -b * x + a * y
        components[comp] = True
    print(len(components))
else:
    g = abs(D)
    key_counts = {}
    for x, y in points:
        p = (d * x - c * y) % g
        q = (-b * x + a * y) % g
        key = (p, q)
        key_counts[key] = True
    print(len(key_counts))