Xiaoyu Buys Stationery

Problem Source

Luogu P1421

Problem Description

The homeroom teacher gave Xiaoyu a task: buy as many signing pens as possible at the stationery shop. A signing pen costs $1$ yuan $9$ jiao, and the teacher gave Xiaoyu $a$ yuan $b$ jiao. Xiaoyu wants to know the maximum number of signing pens she can buy.

Input Format

The input is a single line containing two integers: $a$ and $b$.

Output Format

Output one line containing one integer: the maximum number of signing pens Xiaoyu can buy.

Sample Input

10 3

Sample Output

5

Constraints

For all test cases, $0 \leq a \leq 10^4$, $0 \leq b \leq 9$ are guaranteed.

Hint

• The money is given as "so many yuan and so many jiao", while a pen is $1$ yuan $9$ jiao — the units don't match. First convert all money to a single unit before computing.
• "The maximum number of pens" is an integer answer — think about whether integer division's truncation toward zero helps you.
• Check against the sample: 10 3 → 5.