input: Write a function to calculate the sum of a list of 15 integers and return the total. 
  
  def sum_nums(nums):
      total = 0
      for num in nums:
          total += num
      return total
  
  assert sum_nums([1, 5, 9, 0, 2, 4, 7, 8, 6, 10, 3, 11, 12, 13, 14])==105
output: def sum_nums(nums):
      total = 0
      for num in nums:
          total += num
      return total