import re

accumulator = 0
with open("input.txt") as input:
    while line := input.readline():
        if match := re.match(".*?([0-9]).*([0-9]).*?", line):
            # print(match.groups(1))
            number = int(match.groups(1)[0] + match.groups(1)[1])
            # print(number)
            accumulator += number
        elif match := re.match(".*([0-9]).*", line):
            # print(match.groups(1))
            number = int(match.groups(1)[0] + match.groups(1)[0])
            # print(number)
            accumulator += number
print(accumulator)