[UVa 10346] Peter's Smoke

#include<bits/stdc++.h>
using namespace std;

int main()
{
    int n, k;
    while (cin>>n>>k) {
        int b=0, s=0;
        while (n>0) {
            s+=n;
            b+=n;
            n=b/k;
            b=b%k;
        }
        cout<<s<<endl;
    }
    return 0;
}