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

from collections import defaultdict
counter = defaultdict(int)

if D != 0:
    mod = abs(D)
    for x, y in points:
        val1 = (d * x - c * y) % mod
        val2 = (-b * x + a * y) % mod
        counter[(val1, val2)] += 1
else:
    if a == 0 and b != 0:
        mod = b
        for x, y in points:
            ry = y % mod
            counter[(x, ry)] += 1
    elif b == 0 and a != 0:
        mod = a
        for x, y in points:
            rx = x % mod
            counter[(y, rx)] += 1
    else:
        for x, y in points:
            param = b * x - a * y
            counter[param] += 1

print(len(counter))