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 JavaScript (node.js v5.12) (judge verdict: Accepted)

"use strict"

function main(input) {
  input = input.split(/\s/).map(v => ~~v)

  console.log(input[0] - input[1] + 1)
}
main(require("fs").readFileSync("/dev/stdin", "utf8"))