input: from typing import List
  
  
  def calculate_sum_with_lambda(a: int, b: int) -> int:
      """ Calculate the sum of two integer variables using a lambda function.
      >>> calculate_sum_with_lambda(3, 4)
      7
      >>> calculate_sum_with_lambda(0, 0)
      0
      """
output:     return (lambda x, y: x + y)(a, b)