uva 10346

#include<stdio.h>
int main()
{
    int n,k,have;
    while(scanf("%d%d",&n,&k)==2&&k>1)
    {
        have=n;
        while(n>=k)
        {
            have=have+n/k;
            n=n/k+n%k;
        }
        printf("%d\n",have);
    }
    return 0;
}