import sys
input = sys.stdin.readline
from math import gcd

P, Q = map(int, input().split())
g = gcd(P, Q)
P //= g
Q //= g
ans = 0
N = int(input())
for _ in range(N):
    X, Y = map(int, input().split())
    if X % g or Y % g:
        continue
    X //= g
    Y //= g
    if P % 2 == 0 or Q % 2 == 0:
        ans += 1
        continue
    if X % 2 == Y % 2:
        ans += 1

print(ans)