> #include<iostream>
> using namespace std;
> int main()
> {
>     int n,k,sum;
>     while(cin>>n>>k){
>       sum=n;
>       while(n>=k){
>         sum+=n/k;
>         n=n%k+n/k;
>       }
>       cout<<sum<<endl;
>     }
> }