NYOJ 题目94 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

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大致意思是假设汤姆有n支香烟，每吸k支香烟就会得到一支新的香烟，求汤姆最多能吸多少支香烟？

#include<stdio.h>
int main()
{
int N;
scanf("%d",&N);
while(N--)
{
int n,k,i;
int sum=0;
scanf("%d %d",&n,&k);
for(i=1;i<=n;i++)
{
sum=sum+1;
if(sum%k==0)
n=n+1;
}
printf("%d",sum);
printf("\n");
}
}

//AC

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