```cpp
#include <bits/stdc++.h>
using namespace std;
int main(){
int n,k;
int sum=0,ans=0;
cin>>n>>k;
sum=n,ans=n;
while(ans>=k){
sum+=ans/k;
ans=ans/k+ans%k;
}
cout<<sum;
return 0;
}
```
by TOLKELL @ 2023-11-18 22:09:58