R2 - المسألة

#17551. R2

الإحصائيات

AI Translation — This statement was translated using AI and may contain inaccuracies. Please refer to the original statement if in doubt.

如果 $S$ 等于 $(R1+R2)/2$，则称数字 $S$ 是两个数字 $R1$ 和 $R2$ 的平均数。Mirko 送给 Slavko 的生日礼物是两个整数 $R1$ 和 $R2$。Slavko 迅速计算出了它们的平均数（恰好也是一个整数），但随后却把 $R2$ 弄丢了！请帮助 Slavko 找回 $R2$。

输入格式

输入仅一行，包含两个整数 $R1$ 和 $S$，两者的范围都在 $-1000$ 到 $1000$ 之间。

输出格式

输出仅一行，包含整数 $R2$。

样例

输入样例 1

11 15

输出样例 1

输入样例 2

4 3

输出样例 2

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