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 Solution{  
      
      static int mod=1000000007;
   
      public static void main(String[] args){ 
                  
                 int n = intt();
                 int k = intt();
                 int i1=1,i2=n,flag=2;
                 int c =k-1;
                   
                  while(c>0){
                     if(flag==2)
                         { out.print(i2+" ");i2--;flag=1;}
                     else
                         { out.print(i1+" ");i1++;flag=2;}
                         c--;
                  }
                if(flag==2)
                   for(int i=i2;i>=i1;i--)
                        out.print(i+" ");
                else
                   for(int i=i1;i<=i2;i++)
                        out.print(i+" ");
               out.flush();
    } 

         static FastReader sc=new FastReader();
         static PrintWriter out = new PrintWriter(System.out);
            static int intt(){
                       int x = sc.nextInt();
                       return(x);
                }
               static long longg(){
                          long x = sc.nextLong();
                           return(x);
                }
               static double doublee(){
                          double t = sc.nextDouble();
                           return(t);
                }
              static String str(){
                       String s = sc.next();
                         return(s);
                }
              static String strln(){

                        String s = sc.nextLine();
                           return(s);
              }
              static long pow(long a,long b){
                       long ans=1;
                      while(b>0){
                          if(b%2==1)
                              ans=(ans*a);
                              a=(a*a)%mod;
                              b=b/2;
                      }
                    return(ans);
                }
           
            static long LCM(long a,long b){
                         return ((a*b)/GCD(a,b));
               }
               static long GCD(long a,long b){
                          
                           if(b%a==0)
                              return(a);
                              return(GCD(b%a,a));
              }

                static long abs(long x,long y)
                   { return(Math.abs(x-y));}

              static long min(long x,long y){
                     return(Math.min(x,y));
                 }

              static long max(long a,long b){
                        return Math.max(a,b);
                  } 

              static long Fermat(long a,long p){
                           long b = p-2,ans=1;
                            while(b>0){
                                 if(b%2==1)
                                      ans=(ans*a)%p;
                                       a=(a*a)%p;
                                       b=b/2;
                              }
                           return(ans);
                   }
              static void Fact(long a[],long m){
                              a[0]=1;
                           for(int i=1;i<a.length;i++)
                                   a[i]=(i*a[i-1])%m;

                      }
              static void Fact_Inv(long a[],long F[],long m){

                                 int n =a.length;
                                     a[n-1]=Fermat(F[n-1],m);
                                 for(int i=n-2;i>=0;i--)
                                        a[i]=((i+1)*a[i+1])%m;
                        }
               /*static  long d, x, y;
              static void extendedEuclid(long A, long B) {
                            if(B == 0) {
                                  d = A;
                                  x = 1;
                                  y = 0;
                              }
                           else {
                                extendedEuclid(B, A%B);
                                 long temp = x;
                                  x = y;
                                 y = temp - (A/B)*y;
                            }
                     } */
                 /*static class pair implements Comparable<pair>{
                       int x,y;
                      pair(int a,int b){
                             x=a;
                             y=b;
                       }
                     public int compareTo(pair p1)
                           { return((p1.x-p1.y)-(this.x-this.y));}
          
                   public boolean equals(Object obj) {
                         if (this == obj)
                                return true;
                        if (obj == null)
                                return false;
                        if (getClass() != obj.getClass())
                                return false;
                         pair other = (pair) obj;
                          if (x != other.x)
                                  return false;
                          if (y != other.y)
                                  return false;
                            return true;
                      }
                      @Override
                 public int hashCode() {
                      return(x-y);
                   } 
          }   */
   static class FastReader { 
        BufferedReader br; 
        StringTokenizer st; 
  
        public FastReader() 
        { 
            br = new BufferedReader(new
                     InputStreamReader(System.in)); 
        } 
  
        String next() 
        { 
            while (st == null || !st.hasMoreElements()) 
            { 
                try
                { 
                    st = new StringTokenizer(br.readLine()); 
                } 
                catch (IOException  e) 
                { 
                    e.printStackTrace(); 
                } 
            } 
            return st.nextToken(); 
        } 
  
        int nextInt() 
        { 
            return Integer.parseInt(next()); 
        } 
  
        long nextLong() 
        { 
            return Long.parseLong(next()); 
        } 
  
        double nextDouble() 
        { 
            return Double.parseDouble(next()); 
        } 
  
        String nextLine() 
        { 
            String str = ""; 
            try
            { 
                str = br.readLine(); 
            } 
            catch (IOException e) 
            { 
                e.printStackTrace(); 
            } 
            return str; 
        } 
    } 
}