Input consists only of single integer, N.
You must print the answer obtained by given function,

int LittleFun(int N) :

  res = 1

  for i = 1, i ≤ N, ++i

     if gcd(i, N) = 1:

      res = (res * i) % N

  return res

That would be it.

Contraints:
1 ≤ N ≤ 10¹⁸