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 java.io.*;
import java.util.*;
public class Ex {
    public static void main(String[] args)throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
        String[] s=br.readLine().split(" ");
        int k=Integer.parseInt(s[0]);
        int r=Integer.parseInt(s[1]);
        int sum=0;
        sum=sum+k;
        int c=1;
        while(c>0){
             c=k/r;
            k=c+(k%r);
            sum=sum+c;
        if(k<r){
            break;
        }
        }
        bw.write(sum+"\n");
    bw.flush();
    }
}

