N,X,Q=map(int, input().split())

ans=0
for i in range(Q):
  M=int(input())
  D=list(map(int, input().split()))
  F={};f=0
  for d in D:
    if d not in F:
      F[d]=0
    F[d]+=1
    if d!=X and F[d]>1:
      f=1 
  if X in F:
    ans+=2 
  elif f==1:
    ans+=1 
print(ans/2)