# Open the input file
with open("input.txt", "r") as input_file:
  # Read the input
  calories = []
  current_elf_calories = []
  for line in input_file:
    line = line.strip()
    if line == "":
      # Empty line, start a new list of calories for the next Elf
      calories.append(current_elf_calories)
      current_elf_calories = []
    else:
      # Non-empty line, add the number of calories to the current Elf's list
      current_elf_calories.append(int(line))

  # Add the last Elf's calories to the list (if any)
  if current_elf_calories:
    calories.append(current_elf_calories)

  # Find the total number of calories for each Elf
  totals = [sum(c) for c in calories]

  # Find the maximum number of calories and print the result
  max_calories = max(totals)
  print(max_calories)