> #include<stdio.h>
> main()
> {
>   int n,k,m,i;
>     scanf("%d%d",&n,&k);
>     m=n;
>     while (m/k!=0)
>      {
>        n=n+m/k;
>        m=m/k;
>      }
>     printf("%d\n",n);
>   }
> }