C :

#include<stdio.h>

int main()
{
	int m,k,d;
	while(scanf("%d%d",&m,&k)!=EOF,m||k)
	{
		d=0;
		while(m)
		{
			m--;
			d++;
			if(d%k==0)
				m++;
		}
		printf("%d\n",d);
	}
	return 0;
}

C++ :

#include<stdio.h>

int main()
{
	int m,k,d;
	while(scanf("%d%d",&m,&k)!=EOF,m||k)
	{
		d=0;
		while(m)
		{
			m--;
			d++;
			if(d%k==0)
				m++;
		}
		printf("%d\n",d);
	}
	return 0;
}

Java :

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		while(true){
			int m = in.nextInt();
			int k = in.nextInt();
			if(m==0 && k==0)break;
			int tem = m;
			while(true){
				if(tem<k)break;
				m += tem/k;
				tem = tem%k+tem/k;
			}
			System.out.println(m);
		}
	}

}