5 3
 1000 3
 777 17
 4 3
 2 2
 100 4
 10 4
 999 2
 6 4
 1 2
 17 3
 1 4
 26 8
 91 5
 1 3
 1000 2
 20 3
 9 4
 123 5
 1000 1000
 3 2
 3 3
 80 970
 1000 4
 1 1000

7
 1499
 825
 5
 3
 133
 13
 1997
 7
 1
 25
 1
 29
 113
 1
 1999
 29
 11
 153
 1001
 5
 4
 80
 1333
 1

import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MatchGenerator;

import javax.jws.soap.SOAPBinding;
import java.util.Arrays;
import java.util.Random;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.PrintWriter;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) throws FileNotFoundException {
        Scanner sc = new Scanner(System.in);
        PrintWriter pw = new PrintWriter(System.out);
        int   candles = sc.nextInt();
        int remake = sc.nextInt();
        int hours = candles;
        int used = 0;
        for (int i = 0; candles/remake!=0; i+=2) {
            hours+=1;
            used = candles%remake;
            candles=candles/remake;
        }
        System.out.println(hours+1);

    }
            }


