input = open("input.txt").read().splitlines()

def find_biggest_num(line, start, is_first_num):
    num = -1
    max_num = 9
    while True:
        num = line.find(str(max_num), start)
        if num == -1 or (is_first_num and num == len(line) - 1):
            max_num -= 1
        else:
            return num
answer = 0

for line in input:
    first_num = find_biggest_num(line, 0, True)
    second_num = find_biggest_num(line, first_num + 1, False)
    answer += int(line[first_num] + line[second_num])

print(answer)