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);
         }
     }
 }