Hi
I try to solve this task by computing cycle for i in [1..n] (k : P^k(i) = i) and multiplying all k[i] (not forgetting about if k[j] > k[i] and k[j] % k[i] == 0 then k[i] = 1)
And i got the WA #7. Where is my mistake?
Sorry for my poor english.

I found my mistake. Just used LCM(k[i])