10346 Peters Smokes-re7i46Jy.txt

#include<iostream>
#include<cstdio>
using namespace std;
int main()
{
    long long int n,k;
    while(scanf("%lld%lld",&n,&k)!=EOF){
        long long int cig = n;
        while(n>=k){
            cig+=(n/k);
            n = (n/k)+(n%k);
        }
        cout<<cig<<endl;
    }

    return 0;
}