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

#!/usr/bin/env python

import math

def main():

    a, b = raw_input().split()
    
    a = float(a)
    b = float(b)
    
    noOfHours = a
    
   
    if a >= b:
        while int(a) > 0:  
            tempVar = float(a / b)
            noOfHours += tempVar
            a = tempVar
     
    
    print int(noOfHours)
       
    
if __name__ == "__main__":
    main()