cigarettes

描述

Tom has many cigarettes. We hypothesized that he has n cigarettes and smokes them

one by one keeping all the butts. Out of k > 1 butts he can roll a new cigarette. 
Now，do you know how many cigarettes can Tom has?

 

输入

First input is a single line,it's n and stands for there are n testdata.then there are n lines ,each line contains two integer numbers giving the values of n and k.

输出

For each line of input, output one integer number on a separate line giving the maximum number of cigarettes that Peter can have.

样例输入

3
4 3
10 3
100 5

样例输出

5
14
124

import java.util.Arrays;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner=new Scanner(System.in);
        int T;
        int n;
        int k;
        int count;
        int temp;
        
        T=scanner.nextInt();
        
        while(true){
            if(T==0)
                break;
            T--;
            
            n=scanner.nextInt();
            k=scanner.nextInt();
            
            count=0;
            temp=n;
            while(true){
                if(n>=k){
                    n=n-k+1;
                    count++;
                }
                else
                    break;
            }
            System.out.println(count+temp);    
        }
    }    
}