Permutation p is an ordered set of integers p1, p2, ..., pn, consisting of n distinct positive integers not larger than n. We'll denote as n the length of permutation p1, p2, ..., pn.

Your task is to find such permutation p of length n, that the group of numbers |p1 - p2|, |p2 - p3|, ..., |pn - 1 - pn| has exactly k distinct elements.

Input

The single line of the input contains two space-separated positive integers n, k (1 ≤ k < n ≤ 105).

Output

Print n integers forming the permutation. If there are multiple answers, print any of them.

Examples

Input

3 2


Output

1 3 2


Input

3 1


Output

1 2 3


Input

5 2


Output

1 3 2 4 5

Note

By |x| we denote the absolute value of number x. 
import java.util.Scanner;


public class PlayGround {

	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		
		int n = in.nextInt();
		int k = in.nextInt();
		
		int p = k + 1;
		for (int i = 0; i < k + 1; i++)
			if (i % 2 == 0) {
				System.out.print(((i + 1) / 2 + 1) + " ");
			} else {
				System.out.print(p + " ");
				p--;
			}
		for (int i = k + 1; i < n; i++)
			System.out.print((i+ 1) + " ");
		
		System.out.println();
	}
}
