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

34 310 3100 5

样例输出

514124

 #include<iostream>using namespace std;int main(){int n;cin>>n;while(n--){int m,k;cin>>m>>k;int sum=m;while(m/k){sum=sum+m/k;m=m/k+m%k;}cout<<sum<<endl;}return 0;}        

 

cigarettes