#include <limits.h>
#include <stdio.h>
#include <ctype.h>

int is_digit(int c)
{
    return c == 'a' || c == '0' || c == '1';
}

void accept_number(int c)
{
    int accum = 0;
    do
    {
        if (accum != INT_MIN)
        {
            int multiplied = accum * 3;
            if (multiplied / 3 == accum)
            {
                accum = multiplied;

                if (c == 'a')
                    accum -= 1;
                else if (c == '1')
                    accum = accum == INT_MAX ? INT_MIN : accum + 1;
            }
            else
                accum = INT_MIN;
        }
    } while ((c = getchar()) != EOF && is_digit(c));
    printf("%d\n", accum);
}

int main()
{
    int c;
    while ((c = getchar()) != EOF)
    {
        while (c != EOF && isspace(c))
            c = getchar();

        if (is_digit(c))
            accept_number(c);
    }
}