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;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp111 {
    class Program {
        static void Main(string[] args)
        {
            String input = Console.ReadLine();
            String[] inputArr = input.Split(' ');

            int[] inputInt = StringToInteger(inputArr);

            int ans = inputInt[0] - (inputInt[1] - 1);
            Console.WriteLine(ans);
        }

        static int[] StringToInteger(string[] input)
        {
            int[] inputInt = new int[2];
            int i = 0;

            foreach(string n in input)
            {
                inputInt[i] = int.Parse(n);
                i++;
            }

            return inputInt;
        }
    }
}