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;
}

Pascal :

var m,n,t,p:integer;
begin
  m:=1;
  while (m<>0) or (n<>0) do begin
    readln(m,n);
    if (m=0) and (n=0) then break;
    while m>0 do begin
      inc(t);p:=p+1;m:=m-1;
      if p=n then begin m:=m+1;p:=0; end;
    end;
    writeln(t);t:=0;p:=0;
  end;
end.

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);
		}
	}

}

Python :

import sys
  
def check(m,k):
    i=0
    while True:
          if m!=0:
              m -= 1
              i +=1
              if i%k==0:
                 m = m+1
          if m==0:
              break
    return i

for line in sys.stdin:
    m,k=map(lambda x:int(x),line.split())
    if m!=0 and k!=0:
       print check(m,k)