input: 
  from typing import List
  
  def find_largest_number(numbers: List[int]) -> int:
      """ Finds the largest number in the given list of integers.
      >>> find_largest_number([1000, 506, 299, 620, 35])
      1000
      """
  
output:     if not numbers:
          return None
      largest = numbers[0]
      for num in numbers:
          if num > largest:
              largest = num
      return largest