47_candles_codeforces.cpp

//
//  main.cpp
//  candles

// codeforces question
//                   A. New Year Candles


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