import sys

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)
        s = (b, -a)
        groups = set()
        for x, y in points:
            val = s[0] * x + s[1] * y
            mod_val = val % D_abs
            groups.add(mod_val)
        print(len(groups))
    else:
        if (a == 0 and b == 0) or (c == 0 and d == 0):
            print(N)
            return

        if (a == 0 and c != 0) or (b == 0 and d != 0):
            groups = set()
            for x, y in points:
                groups.add(y)
            print(len(groups))
        else:
            groups = set()
            for x, y in points:
                groups.add(y)
            print(len(groups))

if __name__ == "__main__":
    main()