ZZULIOJ 1069: 向Z同学学习 JAVA

import java.util.*;
public class Main {
 
    public static void main(String[] args) {
        Scanner cin = new Scanner(System.in);
        int k,m;
        m = cin.nextInt();
        k = cin.nextInt();
        int res = 0;
        while(true){
            m--;
            if(m < 0)break;
            res++;
            if(res % k == 0)m++;
 
        }
        System.out.println(res);
    }
 
}