text: from file_reader import get_file_entries_numbers
  from itertools import combinations
  import math
  
  def calculator(combination_size, filename='day1/input.txt'):
      numbers = get_file_entries_numbers(filename)
      for element in combinations(numbers, combination_size):
          if sum(element) == 2020:
              print(math.prod(element))
  
  def sub1():
      calculator(2)
  
  def sub2():
      calculator(3)