def solve(s):
    flag = [False] * len(s)
    ans = 0
    def loop(i, score):
        nonlocal flag, ans
        if i >= len(s) - 2:
            ans = max(ans, score)
            return
        loop(i + 1, score)
        if s[i] == '0':
            return
        if flag[i]:
            return
        for j in range(i + 1, len(s) - 1):
            if s[i] == s[j]:
                continue
            if flag[j]:
                continue
            flag[j] = True
            for k in range(j + 1, len(s)):
                if flag[k]:
                    continue
                if s[j] != s[k]:
                    continue
                flag[k] = True
                tmp = int(s[i] + s[j] + s[k])
                loop(i + 1, score + tmp)
                flag[k] = False
            flag[j] = False
    loop(0, 0)
    return ans
    
s = input()
ans = solve(s)
print(ans)