10346 - Peter's Smokes

Problem B

Peter’s Smokes

Input: standard input

Output: standard output

Time Limit: 4 seconds

Memory Limit: 32 MB

 

Peter has n cigarettes. He smokes them one by one keeping all the butts. Out of k > 1 butts he can roll a new cigarette.

How many cigarettes can Peter have?

Input

Input is a sequence of lines. Each line contains two integer numbers giving the values of n and k. The input is terminated by end of file.

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

4 3

10 3

100 5

Sample Output

5

14

124

#include"stdio.h"
int main()
{  long n,k,s,m;//n为烟，m为烟头，k为换率，s为总数; 
   while(scanf("%ld%ld",&n,&k)!=EOF)
   {s=0;
    s+=n;
    m=n;
    while(m>=k)
    {n=m/k;
     s+=n;
     m=m%k+n;
     } 
     printf("%ld\n",s);
     }
return 0;
}