import math


MOD = 998244353 


N, M = map(int, input().split())
mapping = list(range(1, N+1))
for _ in range(M):
    S = list(map(int, input().split()))[1:]
    tmp = {mapping[S[(i+1)%len(S)]-1]: mapping[S[i]-1] for i in range(len(S))}
    for i in range(N):
        if mapping[i] in tmp:
            mapping[i] = tmp[mapping[i]]

lst = list(range(1, N+1))
cnt = 0
while 1:
    for i in range(N):
        lst[i] = mapping[lst[i]-1]
    cnt += 1

    for i in range(N):
        if lst[(i+1)%N] != ((lst[i] + 1) % (N + 1) if (lst[i] + 1) % (N + 1) != 0 else 1):
            break
    else:
        move = lst.index(1)
        break

# cntで全体がmoveだけ動く
if lst == list(range(1, N+1)):
    print(cnt)
else:
    print((cnt * (N * move / (math.gcd(N, move)))) % MOD)