a, b=map(int,input().split())
s=0
while a>=b:
a+=1-b
s+=b
s+=a
print(s)
127. Word Ladder | 123. Best Time to Buy and Sell Stock III |
85. Maximal Rectangle | 84. Largest Rectangle in Histogram |
60. Permutation Sequence | 42. Trapping Rain Water |
32. Longest Valid Parentheses | Cutting a material |
Bubble Sort | Number of triangles |
AND path in a binary tree | Factorial equations |
Removal of vertices | Happy segments |
Cyclic shifts | Zoos |
Build a graph | Almost correct bracket sequence |
Count of integers | Differences of the permutations |
Doctor's Secret | Back to School |
I am Easy | Teddy and Tweety |
Partitioning binary strings | Special sets |
Smallest chosen word | Going to office |
Color the boxes | Missing numbers |