AT_abc469_a.Train Car

There is a train consisting of $N$ cars. What is the position, counted from the back, of the car that is $K$-th from the front of this train?

有一列由 $N$ 节车厢组成的火车。从车尾开始计数，这列火车中从车头开始数第 $K$ 节车厢的位置是多少？

The input is given from Standard Input in the following format:

$N$ $K$

输入从标准输入中以如下格式给出：

$N$ $K$

If the car is $X$-th from the back, output the integer $X$ in one line.

如果该车从后往前数是第 $X$ 辆，则在一行中输出整数 $X$。

Sample 1 Explanation:
For a train consisting of five cars, the car that is second from the front is fourth from the back.

Constraints

• $1 \leq K \leq N \leq 100$
• All input values are integers.

样例 1 解释：
对于一列由五节车厢组成的列车，从车头数起第二节车厢，是从车尾数起第四节车厢。

约束条件

• $1 \leq K \leq N \leq 100$
• 所有输入值均为整数。