#!/usr/bin/env python3.8
# %%
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
from math import gcd

# %%
a, b, c, d = map(int, readline().split())
N = int(readline())
m = map(int, read().split())
X, Y = zip(*zip(m, m))


# %%
def fund_transform(a, b, c, d):
    while True:
        if a < c:
            a, c = c, a
            b, d = d, b
        if c == 0:
            if a == 0:
                b = abs(gcd(b, d))
                d = 0
            elif d == 0:
                pass
            else:
                d = abs(d)
                b %= d
            return a, b, c, d
        n = a // c
        a -= n * c
        b -= n * d


def calc_key(x, y):
    if not a:
        y %= b
        return b * x + y
    n = x // a
    x -= a * n
    y -= b * n
    if not d:
        return a * y + x
    y %= d
    return a * y + x


# %%
a, b, c, d = fund_transform(a, b, c, d)
keys = (calc_key(x, y) for x, y in zip(X, Y))
print(len(set(keys)))