import bisect
import copy
import decimal
import fractions
import heapq
import itertools
import math
import random
import sys
import time
from collections import Counter,deque,defaultdict
from functools import lru_cache,reduce
from heapq import heappush,heappop,heapify,heappushpop,_heappop_max,_heapify_max
def _heappush_max(heap,item):
    heap.append(item)
    heapq._siftdown_max(heap, 0, len(heap)-1)
def _heappushpop_max(heap, item):
    if heap and item < heap[0]:
        item, heap[0] = heap[0], item
        heapq._siftup_max(heap, 0)
    return item
from math import gcd as GCD
read=sys.stdin.read
readline=sys.stdin.readline
readlines=sys.stdin.readlines
write=sys.stdout.write
#import pypyjit
#pypyjit.set_param('max_unroll_recursion=-1')
#sys.set_int_max_str_digits(10**9)

a,b,c,d=map(int,readline().split())
N=int(readline())
se=set()
if a*d==b*c:
    gx=GCD(a,c)
    if gx==0:
        gx=1<<60
    gy=GCD(b,d)
    if gy==0:
        gy=1<<60
    for n in range(N):
        x,y=map(int,readline().split())
        se.add((x%gx,y%gy))
else:
    for n in range(N):
        x,y=map(int,readline().split())
        se.add(((d*x-c*y)%abs(a*d-b*c),(-b*x+a*y)%abs(a*d-b*c)))
ans=len(se)
print(ans)