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import math
n = int(input())

res = 1
val = [0] * n
val[0] = 1

for u in range(n):
    line = [int(x) for x in input().split(' ')]
    e = line[0]
    line = line[1:]

    if e > 0:
        mul = e // math.gcd(e, val[u])
        res *= mul
        for i in range(n):
            val[i] *= mul
        for v in line:
            val[v - 1] += val[u] // e

print(res)