B1022

#include <stdio.h>
// B1022
int main()
{
    int a,b,d;
    scanf("%d%d%d", &a, &b, &d);

    int sum = a + b;
    int ans[31], num = 0;

    do{ //进制转换 
        ans[num++] = sum%d;
        sum /= d;
    }while(sum != 0);

    for (int i=num-1; i>=0; i--){
        printf("%d", ans[i]);
    }
    return 0;
}