Problem:
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

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

Solution in C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System.Linq;
class ABC107A
{
    static void Main()
    {
        var input=System.Console.ReadLine()
          .Split(' ')
          .Select(x=>int.Parse(x))
          .ToArray();
        ;
        System.Console.WriteLine(
            input[0]+1-input[1]
        );
    }
}