num=[int(x) for x in input().split(" ")]
n=int(input())
jud=[]    #判斷兩個商品都購買的條件是否成立
jud1=[]    #判斷編號1購買是否成立
jud2=[]    #判斷編號2購買是否成立
for i in range(n):
  buy=[int(x) for x in input().split(" ")]
  if num[0] in  buy and num[1] in buy:
    for i in range(len(buy)):
      if buy[i]==num[0]:
        jud1.append(1)
      elif buy[i]==-1*num[0]:
        jud1.append(-1)
      elif buy[i]==num[1]:
        jud2.append(1)
      elif buy[i]==-1*num[1]:
        jud2.append(-1)
  if sum(jud1)>0 and sum(jud2)>0:
    jud.append(1)
  jud1.clear()
  jud2.clear()
print(str(sum(jud)))