import math

def f(a,b,p,c,d,q):
    if a*d-b*c==0:
        return p*c==q*a
    else:
    	x=(p*d-b*q)/(a*d-b*c)
    	y=(a*q-p*c)/(a*d-b*c)
    	if math.isclose(x,round(x)) and math.isclose(y,round(y)):
    		return True
    	else:
    		return False

a,b,c,d=tuple(map(int,input().split()))
n=int(input())
live=[]
for i in range(n):
	live.append(list(map(int,input().split())))

group=[]

for i in live:
	notingroup=True
	for j in group:
		k=j[0]
		if f(a,c,k[0]-i[0],b,d,k[1]-i[1]):
			j.append(i)
			notingroup=False
			break
	if notingroup:
		group.append([i])

print(len(group))