p03272 AtCoder Beginner Contest 107 - Train_17001
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.

Examples

Input

4 2


Output

3


Input

1 1


Output

1


Input

15 11


Output

5
n,k = map(int,raw_input().split())
print n-k+1