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 Java8 (OpenJDK 1.8.0) (judge verdict: Runtime Error)

import java.util.Scanner;

class Main{
	public static void main(String[] args) {
		Scanner sc=new Scanner(System.in);
		int N=sc.nextInt();
		int K=sc.nextInt();
		int max=200000007;
		int now_cost=0;
		int[] point=new int[N];

		for(int i=0; i<N; i++) {
			point[i]=sc.nextInt();
		}

		for(int i=0; i<N-K+1; i++) {
			now_cost=0;
			now_cost=Math.min(Math.abs(point[i])+point[K-1+i]-point[i],Math.abs(point[K-1+i])+point[K-1+i]-point[i]);
			max=Math.min(max,now_cost);
		}

		System.out.println(max);
	}
}