p03272 AtCoder Beginner Contest 107 - Train_17004
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
//Train.java
import java.util.Scanner;
class Main
{
	public static void main(String args[])
	{
		Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();
        int i=sc.nextInt();

        System.out.println((n-i)+1);
        sc.close();
    }
}