import sys
from collections import defaultdict

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:
        groups = defaultdict(int)
        if a == 0:
            # v1 is (0, b), b != 0
            for x, y in points:
                mod_y = y % b if b != 0 else y
                key = (x, mod_y)
                groups[key] += 1
        elif b == 0:
            # v1 is (a, 0), a != 0
            for x, y in points:
                mod_x = x % a if a != 0 else x
                key = (mod_x, y)
                groups[key] += 1
        else:
            # a and b are non-zero
            denom = a * a + b * b
            for x, y in points:
                numerator = x * a + y * b
                k = numerator // denom
                rx = x - k * a
                ry = y - k * b
                key = (rx, ry)
                groups[key] += 1
    else:
        groups = defaultdict(int)
        abs_D = abs(D)
        for x, y in points:
            mol_k = d * x - c * y
            mol_l = -b * x + a * y
            r_k = (mol_k % abs_D + abs_D) % abs_D
            r_l = (mol_l % abs_D + abs_D) % abs_D
            key = (r_k, r_l)
            groups[key] += 1
    print(len(groups))

if __name__ == "__main__":
    main()