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:
    d_abs = abs(D)
    components = set()
    for x, y in points:
        # Calculate (-b*x + a*y) mod d_abs
        component = (-b * x + a * y) % d_abs
        components.add(component)
    print(len(components))
else:
    # Calculate the orthogonal component: b*x - a*y
    components = set()
    for x, y in points:
        component = b * x - a * y
        components.add(component)
    print(len(components))