#include <stdio.h>
#include <math.h>

int main(void)
{
    int line, num, band, sum, i;
    char ch_l, ch_r;

    while(scanf("%d", &line) != EOF)
    {
        if(line == 0) break;

        sum = 0;
        while(line--)
        {
            i = 0;
            scanf("%d%c%d%c", &num, &ch_l, &band, &ch_r);

            while(num)
            {
                sum += num % 10 * pow(band,i++);
                num /= 10;
            }

        }
        printf("%d\n", sum);
    }

    return 0;
}