input: Write a python function to get the sum of the two largest positive numbers in a list.
  assert get_sum([1, 2, 3, 4, 5]) == 9
  assert get_sum([10, 20, 30, 40, 50]) == 90
  assert get_sum([5, 7, 9, 8, 6]) == 17
output: def get_sum(lst):
      lst = sorted(lst, reverse=True)
      return lst[0] + lst[1]