cigarettes

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.

用例

用例输入

3
4 3
10 3
100 5

用例输出

5
14
124

作者

rooot

来源

NYOJ