# coding: utf-8
# Your code here!
import sys
sys.setrecursionlimit(10**6)
readline = sys.stdin.readline #文字列入力のときは注意

from math import gcd

a,b,c,d = [int(i) for i in readline().split()]
n = int(input())
xy = [[int(i) for i in readline().split()] for _ in range(n)]


def heikouidou(x,y,pp,qq,g,h): #(e,f)に沿って(g,h)以上のぎりぎり
    m = (x*h-y*g)//(h*pp-g*qq)
    x -= m*pp
    y-= m*qq
    return (x,y)
    
    
    
if a*d == b*c:
    if a==0 and c==0:
        g = gcd(b,d)
    else: g = gcd(a,c)
#    print(a,b,c,d,g)
#    assert b%g==0
    p,q = a//g, b//g
    s = set()
    for x,y in xy:
        s.add(heikouidou(x,y,p,q,-q,p))
    print(len(s))
#    print(s)
    exit()

        
s = set()
for x,y in xy:
#    print(x,y)
    x,y = heikouidou(x,y,a,b,c,d)
#    print(x,y)
    x,y = heikouidou(x,y,c,d,a,b)
#    print(x,y)
    s.add((x,y))
print(len(s))
#print(s)
exit()