5 3
 1000 3
 777 17
 4 3
 2 2
 100 4
 10 4
 999 2
 6 4
 1 2
 17 3
 1 4
 26 8
 91 5
 1 3
 1000 2
 20 3
 9 4
 123 5
 1000 1000
 3 2
 3 3
 80 970
 1000 4
 1 1000

7
 1499
 825
 5
 3
 133
 13
 1997
 7
 1
 25
 1
 29
 113
 1
 1999
 29
 11
 153
 1001
 5
 4
 80
 1333
 1

# include <stdio.h>
int ha(int a, int b,int remain)
{
    int new;
    new = (a+remain)/b;
    remain = a%b;
    if (new == 0)
        return a;
    return a+ha(new,b,remain);
}
main ()

{
    int a, b;
    scanf ("%d%d", &a, &b);
    printf("%d",ha(a,b,0));
    return 0;
}
