Score : $100$ points

问题描述

高桥想给圣诞老人寄一封信。他有一个信封，上面贴着一张面值为 $X$ 日元（日本货币）的邮票。

为了能成功寄送给圣诞老人，信封上的邮票总价值必须至少达到 $Y$ 日元。

高桥打算再贴一些面值为 $10$ 日元的邮票，以确保信封上邮票的总价值至少为 $Y$ 日元。

请问高桥至少需要在信封上再贴多少张面值为 $10$ 日元的邮票？

以上为通义千问 qwen-max 翻译，仅供参考。

Problem Statement

Takahashi wants to send a letter to Santa Claus. He has an envelope with an $X$-yen (Japanese currency) stamp stuck on it.
To be delivered to Santa Claus, the envelope must have stamps in a total value of at least $Y$ yen.
Takahashi will put some more $10$-yen stamps so that the envelope will have stamps worth at least $Y$ yen in total.
At least how many more $10$-yen stamps does Takahashi need to put on the envelope?

Constraints

• $X$ and $Y$ are integers.
• $1 \le X,Y \le 1000$

Input

Input is given from Standard Input in the following format:

$X$ $Y$

Output

Print the answer as an integer.

Sample Input 1

80 94

Sample Output 1

2

• After adding zero $10$-yen stamps to the $80$-yen stamp, the total is $80$ yen, which is less than the required amount of $94$ yen.
• After adding one $10$-yen stamp to the $80$-yen stamp, the total is $90$ yen, which is less than the required amount of $94$ yen.
• After adding two $10$-yen stamps to the $80$-yen stamp, the total is $100$ yen, which is not less than the required amount of $94$ yen.

Sample Input 2

1000 63

Sample Output 2

0

The envelope may already have a stamp with enough value.

Sample Input 3

270 750

Sample Output 3

48

update @ 2024/3/10 10:08:23