# Test testinput
with open("testinput", "r") as fp:
	batteries = fp.readlines()

def bruteforce_joltage(battery):
	"""
	Makes all combinations and returns the largests

	Complexity: O(len(battery))
	"""

	joltage_battery_max = 0
	for i in range(len(battery) - 1):
		for j in range(i + 1, len(battery)):
			joltage = int(battery[i] + battery[j])
			if joltage > joltage_battery_max:
				joltage_battery_max = joltage
	return joltage_battery_max

for idx_battery, joltage in enumerate([98, 89, 78, 92]):
	assert bruteforce_joltage(batteries[idx_battery]) == joltage

output_joltage = 0
for battery in batteries:
	joltage_battery_max = bruteforce_joltage(battery)
	output_joltage += joltage_battery_max

assert output_joltage == 357

# Perform final stuff
with open("input", "r") as fp:
	batteries = fp.readlines()

output_joltage = 0
for battery in batteries:
	joltage_battery_max = bruteforce_joltage(battery)
	output_joltage += joltage_battery_max

print(output_joltage)