MOD = 998244353
def II(): return int(input())
def LI(): return list(input())
def LMI(): return list(map(int, input().split()))
def LMS(): return list(map(str, input().split()))
def LLMI(x): return [list(map(int, input().split())) for _ in range(x)]
def LLMS(x): return [list(input()) for _ in range(x)]
  
def execute():
    n, x, q = LMI()
    result = 0
    for _ in range(q):
        m = II()
        f = LMI()
        set_f = set(f)
        
        if x in set_f:
            result += 1
        elif m > len(set_f):
            result += 1/2
        else:
            continue
    
    print(result)
            

if __name__ == "__main__":
    T = 1
    for _ in range(T):
        execute()