Mimi has just won two raffle tickets for the Polar Express! Unfortunately, there is just one obstacle in the way — the skill testing question!
Let us define to be the sum of digits of . Given two positive integers, and , compute the number of distinct values of , for .
Mimi has agreed to give you the other ticket if you help her solve this problem. Can you do it?
Subtask 1 [10%]
Subtask 2 [90%]
The first and only line of input will contain two space separated integers, and .
A single integer, the number of distinct values of .