import sys


def input(): return sys.stdin.readline().rstrip()


def main():
    n, x, q = map(int, input().split())
    ans = 0
    for _ in range(q):
        input()
        *f, = map(int, input().split())
        if x in f:
            ans += 1
        elif len(f) != len(set(f)):
            ans += 0.5

    print(ans)


if __name__ == "__main__":
    main()