UVa 10346 Peter’s Smokes Solution

#include<stdio.h>
int main()
{
int n,k,s,b,tb,r;
while(scanf("%d%d",&n,&k)==2)
{
s=n;
tb=0;
while(s>=k)
    {
    b=s/k;
    r=s%k;
    s=b+r;
    tb=tb+b;
    }
printf("%d\n",n+tb);
}
return 0;
}