import math
from collections import defaultdict

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:
    abs_D = abs(D)
    groups = defaultdict(int)
    for x, y in points:
        r1 = (d * x - c * y) % abs_D
        r2 = (-b * x + a * y) % abs_D
        groups[(r1, r2)] += 1
    print(len(groups))
else:
    # Compute direction vector for the 1D lattice
    g = math.gcd(a, b)
    if a == 0 and b == 0:
        # This case is invalid as per problem constraints, so not possible
        pass
    gx = a // g
    gy = b // g
    groups = defaultdict(int)
    for x, y in points:
        s = gy * x - gx * y
        groups[s] += 1
    print(len(groups))