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?
cigarettes
Input
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.
Output
For each line of input, output one integer number on a separate line giving the maximum number of cigarettes that Peter can have.
Sample Input
3
4 3
10 3
100 5
Sample Output
5
14
124