from collections import Counter

N, X, Q = map(int, input().split())
ans = 0

for _ in range(Q):
    M = int(input())
    F = Counter(map(int, input().split()))

    if X in F:
        ans += 1
    elif max(F.values()) >= 2:
        ans += 1 / 2
    else:
        ans += 0

print(ans)