import sys
import math

def main():
    a, b, c, d = map(int, sys.stdin.readline().split())
    n = int(sys.stdin.readline())
    points = [tuple(map(int, sys.stdin.readline().split())) for _ in range(n)]
    
    D = a * d - b * c
    if D != 0:
        d_abs = abs(D)
        groups = set()
        for x, y in points:
            s = (d * x - c * y) % d_abs
            t = (a * y - b * x) % d_abs
            groups.add((s, t))
        print(len(groups))
    else:
        if a == 0:
            g_y = math.gcd(b, d)
            p, q = 0, g_y
        else:
            g_x = math.gcd(a, c)
            q = (b * g_x) // a
            p = g_x
        
        groups = set()
        for x, y in points:
            s = -q * x + p * y
            groups.add(s)
        print(len(groups))

if __name__ == "__main__":
    main()