n,m = map(int,input().split())
goods = [[]for i in range(n+1)]

def search(i):
    if goods[i]==-1:return False
    if goods[i]!=[]:
        tmp = goods[i][:]
        goods[i] = -1
        for j in tmp:
            if search(j):goods[j]=[]
            else:return False
        goods[i] = []
    return True

for i in range(m):
    g,r = map(int,input().split())
    goods[g] = list(map(int,input().split()))

cnt = 0
for i in range(1,n+1):
    if not search(i):cnt+=1
print(n-cnt)