import sys
import math

def main():
    a, b, c, d = map(int, sys.stdin.readline().split())
    D = a * d - b * c
    N = int(sys.stdin.readline())
    points = [tuple(map(int, sys.stdin.readline().split())) for _ in range(N)]
    
    if D != 0:
        mod = abs(D)
        groups = {}
        for x, y in points:
            s = (d * x - c * y) % mod
            t = (-b * x + a * y) % mod
            key = (s, t)
            if key not in groups:
                groups[key] = 0
            groups[key] += 1
        print(len(groups))
    else:
        def gcd(x, y):
            while y:
                x, y = y, x % y
            return x
        
        g_gcd = gcd(a, b)
        g = (a // g_gcd, b // g_gcd)
        groups = {}
        for x, y in points:
            hp = (-g[1] * x) + (g[0] * y)
            if hp not in groups:
                groups[hp] = 0
            groups[hp] += 1
        print(len(groups))

if __name__ == "__main__":
    main()