#include <stdio.h>

 int convert(int a, int b, int c, int *d, int len)

 {

     int cnt, x;

     int calc = a + b;

     cnt = ;

     while(calc)

     {

         x = calc % c;

         if(cnt < len)

         {

             d[cnt] = x;

         }

         calc /= c;

         cnt++;

     }

     return cnt;

 }

 void reverse(int *d, int len)

 {

     int i, tmp;

     for(i = ; i < len / ; i++)

     {

         tmp = d[i];

         d[i] = d[len-i-];

         d[len-i-] = tmp;

     }

 }

 int main(void)

 {

     int a, b, c;

     int d[];

     int i, len;

     scanf("%d %d %d", &a, &b, &c);

     len = convert(a, b, c, d, sizeof(d)/sizeof(d[]));

     if(len == )

     {

         printf("");

     }

     else

     {

         reverse(d, len);

         for(i = ; i < len; i++)

         {

             printf("%c", d[i]+'');

         }

     }

     return ;

 }