input: Write a python function to count the number of unique permutations of a list of 5 numbers.
  assert count_permutations([1, 2, 3, 4, 5]) == 120
  assert count_permutations([5, 4, 3, 2, 1]) == 120
  assert count_permutations([1, 1, 2, 2, 3]) == 60
output: def count_permutations(lst):
      from itertools import permutations
      unique_permutations = set(permutations(lst))
      return len(unique_permutations)