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问题 A: cigarettes

问题 A: cigarettes

时间限制: 1 Sec  内存限制: 128 MB
提交: 80  解决: 45
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题目描述

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?

输入描述

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.

输出描述

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
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