import sys

sys.setrecursionlimit(10**6)
int1 = lambda x: int(x)-1
p2D = lambda x: print(*x, sep="\n")
def II(): return int(sys.stdin.buffer.readline())
def FI(): return float(sys.stdin.buffer.readline())
def MI(): return map(int, sys.stdin.buffer.readline().split())
def MF(): return map(float, sys.stdin.buffer.readline().split())
def MI1(): return map(int1, sys.stdin.buffer.readline().split())
def LI(): return list(map(int, sys.stdin.buffer.readline().split()))
def LI1(): return list(map(int1, sys.stdin.buffer.readline().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]
def LLI1(rows_number): return [LI1() for _ in range(rows_number)]
def BI(): return sys.stdin.buffer.readline().rstrip()
def SI(): return sys.stdin.buffer.readline().rstrip().decode()
dij = [(0, 1), (-1, 0), (0, -1), (1, 0)]
inf = 10**16
# md = 998244353
md = 10**9+7

from math import gcd

a, b, c, d = MI()
n = II()
xy = LLI(n)

group = set()

if a == c == 0:
    g = gcd(b, d)
    for x, y in xy:
        group.add((x, y%g))

elif b == d == 0:
    g = gcd(a, c)
    for x, y in xy:
        group.add((x%g, y))

elif a*d-b*c==0:
    g = gcd(a, c)
    for x, y in xy:
        group.add((x%g, y%g))

else:
    if c == 0: a, b, c, d = c, d, a, b
    for x, y in xy:
        m = (d*x-c*y+a*d-b*c-1)//(a*d-b*c)
        x, y = x-m*a, y-m*b
        m = x//c
        x, y = x-m*c, y-m*d
        group.add((x, y))

print(len(group))