/**
cigarettes
时间限制:3000 ms |内存限制:65535 KB
难度:2
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
*/
#include<iostream>
using namespace std;
int main()
{
int N;
cin>>N;
while(N--)
{
int n,k;
cin>>n>>k;
int sum=0;
sum+=n;
while(n>=k)
{
sum+=n/k;
n=n/k+n%k;
}
cout<<sum<<endl;
}
return 0;
}