from collections import Counter

n, x, q = map(int, input().split())

ans = 0
for _  in range(q):
    m = int(input())
    f = list(map(int, input().split()))
    if x in f:
        ans += 1
    else:
        counter = Counter(f)
        for k, v in counter.items():
            if v >= 2 and k != x:
                ans += 0.5

print(ans)