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 Test {

    public static void main(String[] argh) throws IOException {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        double n1 = in.nextInt();
//        BufferedReader pr = new BufferedReader(new InputStreamReader(System.in));
//        BufferedWriter wr = new BufferedWriter(new OutputStreamWriter(System.out));
//        String st = pr.readLine();
        int count = n;

        while (n >= n1) {
            count += n / n1;
            n = (int)Math.ceil(n/n1);
        }
        System.out.println(count);

    }

}