from collections import Counter
n, x, q = map(int, input().split())
ans = 0
for _ in range(q):
    m = int(input())
    found = False
    dup = False
    d = Counter(map(int, input().split()))
    ans += 1.0 if x in d else 0.5 if max(d.values()) > 1 else 0.0
print(ans)