def main():
    n = input()
    ans = 0
    used = [False for _ in range(len(n))]
    while True:
        max_x = 0
        max_i, max_j, max_k = None, None, None
        for i in range(len(n)):
            if used[i]:
                continue
            for j in range(i + 1, len(n)):
                if used[j]:
                    continue
                for k in range(j + 1, len(n)):
                    if used[k]:
                        continue
                    if n[i] != n[j] and n[j] == n[k]:
                        if int(n[i] + n[j] + n[k]) > max_x:
                            max_x = int(n[i] + n[j] + n[k])
                            max_i, max_j, max_k = i, j, k

        if max_i is None:
            break

        ans += max_x
        used[max_i] = used[max_j] = used[max_k] = True

    print(ans)


if __name__ == '__main__':
    main()