# Read the input
calories = []
current_elf_calories = []
for line in input_lines:
  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)