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 Python (3.4.3) (judge verdict: Accepted)

# -*- coding: utf-8 -*-
from sys import stdin

ns = lambda: stdin.readline() # s = ns()
ni = lambda: int(stdin.readline()) # N = ni()
na = lambda: list(map(int, stdin.readline().split())) # Array or , = na()

N, i = na()
print(N-i+1)