#include<stdio.h>
int main()
{
    int A,B,D;
    scanf("%d%d%d",&A,&B,&D);
    int he=A+B,Djinzhi[32],num=0;
    do{
        Djinzhi[num++]=he%D;
        he/=D;
    }while(he!=0);
    for(int i=num-1;i>=0;i--)
    {
        printf("%d",Djinzhi[i]);
    }
    return 0;
}