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Score : $100$ points

### Problem Statement

There is an $N$-car train.

You are given an integer $i$. Find the value of $j$ such that the following statement is true: "the $i$-th car from the front of the train is the $j$-th car from the back."

### Constraints

• $1 \leq N \leq 100$
• $1 \leq i \leq N$

### Input

Input is given from Standard Input in the following format:

$N$ $i$


### Sample Input 1

4 2


### Sample Output 1

3


The second car from the front of a $4$-car train is the third car from the back.

### Sample Input 2

1 1


### Sample Output 2

1


### Sample Input 3

15 11


### Sample Output 3

5