FILE = "input.txt"

def main():
    return sum(max_for_line(line.strip()) for line in open(FILE))

def max_for_line(line: str) -> int:
    tens = max(int(n) for n in line[:-1])
    idx = line.index(str(tens))
    ones = max(int(n) for n in line[idx+1:])
    return tens * 10 + ones

if __name__ == "__main__":
    print(main())