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:

$N$ $i$

Output

Print the answer.

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