from collections import defaultdict
N,X,Q=map(int,input().split())
ans=0
for _ in range(Q):
    M=int(input())
    F=list(map(int,input().split()))
    cnt=defaultdict(int)
    multi=0
    for f in F:
        cnt[f]+=1
        if cnt[f]>=2:multi=1
    if X in F:
        ans+=1
    elif multi:
        ans+=0.5
print(ans)