import sys
import math

input = sys.stdin.readline

def lcm(a,b):
    return a*b//math.gcd(a,b)

a,b,c,d=map(int,input().split())
N=int(input())
P=[list(map(int,input().split())) for i in range(N)]


if a*d-b*c==0 and a!=0:
    a1=math.gcd(a,c)
    b1=b//(a//a1)

    def rep_point(p,q):
        k=p//a1

        return p-k*a1,q-k*b1

    Q=[rep_point(P[i][0],P[i][1]) for i in range(N)]

    print(len(set(Q)))
    sys.exit()
    
elif a*d-b*c==0:
    b1=math.gcd(b,d)
    a1=a//(b//b1)

    def rep_point(p,q):
        k=q//b1

        return p-k*a1,q-k*b1

    Q=[rep_point(P[i][0],P[i][1]) for i in range(N)]

    print(len(set(Q)))
    sys.exit()

x = lcm(a,c)

if a==0:
    t=abs(b)
    a,b=c,d
    
    
else:

    while c!=0:
        if a>c:
            a,b,c,d=c,d,a,b
            
        r,q=divmod(c,a)
        c,d=q,d-b*r

    t = abs(d)   

def rep_point(p,q):
    k=p//a

    p-=k*a
    q-=k*b

    q=q%t

    return p,q

Q=[rep_point(P[i][0],P[i][1]) for i in range(N)]

print(len(set(Q)))