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.io.*;
import java.util.*;

public class c {
    private static StringTokenizer st;
    private static BufferedReader br;
    public static long MOD = 1000000007;

    public static void print(Object x) {
        System.out.println(x + "");
    }
    public static String join(List<?> x, String space) {
        StringBuilder sb = new StringBuilder();
        for (Object elt : x) {
            sb.append(elt);
            sb.append(space);
        }
        return sb.toString();
    }

    public static String nextToken() throws IOException {
        while (st == null || !st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine().trim());
        }
        return st.nextToken();
    }
    public static double nextDouble() throws IOException {
        return Double.parseDouble(nextToken());
    }
    public static long nextLong() throws IOException {
        return Long.parseLong(nextToken());
    }
    public static int nextInt() throws IOException {
        return Integer.parseInt(nextToken());
    }
    public static List<Double> nextDoubles(int n) throws IOException{
        List<Double> lst = new ArrayList<Double>();
        for (int i = 0; i < n; i++) {
            lst.add(nextDouble());
        }
        return lst;
    }
    public static List<Integer> nextInts(int n) throws IOException{
        List<Integer> lst = new ArrayList<Integer>();
        for (int i = 0; i < n; i++) {
            lst.add(nextInt());
        }
        return lst;
    }
    public static List<Long> nextLongs(int n) throws IOException{
        List<Long> lst = new ArrayList<Long>();
        for (int i = 0; i < n; i++) {
            lst.add(nextLong());
        }
        return lst;
    }
    public static List<Integer> emptyList(int n, int val) {
        List<Integer> lst = new ArrayList<Integer>();
        for (int i = 0; i < n; i++) {
            lst.add(val);
        }
        return lst;
    }

    public static void main(String[] args) throws Exception {
        boolean debug = false;
        InputStream in = System.in;
        if (debug) {
            in = new FileInputStream("input.in");
        }
        br = new BufferedReader(new InputStreamReader(in));
        print(solve(nextInt(), nextInt()));
    }

    public static String solve(int n, int k) {
        int[] nums = new int[n];
        for (int i = 0; i <= k; i+=2) {
            nums[i] = (i / 2) + 1;
        }
        for (int i = 1; i <= k; i+= 2) {
            nums[i] = k - (i / 2) + 1;
        }

        for (int i = k+1; i < n; i++) {
            nums[i] = i + 1;
        }
        StringBuilder st = new StringBuilder();
        for (int x: nums) {
            st.append(x + " ");
        }
        st.deleteCharAt(st.length()-1);
        return st.toString();
    }
}
