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.