n = int(input())
platforms = []
platforms_indexes = [0 for x in range(0, n)]

for i in range(0, n):
    links = [int(x)-1 for x in input().split()]
    platforms.append(links[1:])

def get_route():
    #route = "0"
    index = 0
    while len(platforms[index]) > 0:
        #route = route + ":" + str(platforms[index][platforms_indexes[index]])
        new_index = platforms[index][platforms_indexes[index]]
        if platforms_indexes[index] == len(platforms[index]) - 1:
            platforms_indexes[index] = 0
        else:
            platforms_indexes[index] += 1
        index = new_index
    #print(route)
    #return route

get_route()
routes = 1

while all(item == 0 for item in platforms_indexes) == False:
    get_route()
    routes += 1
    
print(routes)