Problem: People do many crazy things to stand out in a crowd. Some of them dance, some learn by heart rules of Russian language, some try to become an outstanding competitive programmers, while others collect funny math objects.

Alis is among these collectors. Right now she wants to get one of k-special tables. In case you forget, the table n × n is called k-special if the following three conditions are satisfied:

  * every integer from 1 to n2 appears in the table exactly once; 
  * in each row numbers are situated in increasing order; 
  * the sum of numbers in the k-th column is maximum possible. 



Your goal is to help Alice and find at least one k-special table of size n × n. Both rows and columns are numbered from 1 to n, with rows numbered from top to bottom and columns numbered from left to right.

Input

The first line of the input contains two integers n and k (1 ≤ n ≤ 500, 1 ≤ k ≤ n) — the size of the table Alice is looking for and the column that should have maximum possible sum.

Output

First print the sum of the integers in the k-th column of the required table.

Next n lines should contain the description of the table itself: first line should contains n elements of the first row, second line should contain n elements of the second row and so on.

If there are multiple suitable table, you are allowed to print any.

Examples

Input

4 1


Output

28
1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16


Input

5 3


Output

85
5 6 17 18 19
9 10 23 24 25
7 8 20 21 22
3 4 14 15 16
1 2 11 12 13

Solution (in JAVA):

Solution:
import java.util.*;
import java.io.*;

public class CodeForces {
    
    static boolean g[][];
    
    public static void main(String[] args) throws IOException {
       
        Reader.init(System.in);
        PrintWriter writer = new PrintWriter(System.out);
        
        int n = Reader.nextInt(), k = Reader.nextInt();
        ArrayList<Integer> list = new ArrayList();
        ArrayList<Integer> list2 = new ArrayList();
        boolean v[] = new boolean[n*n + 1];
        
        int num = n*n, com = n - k, sum = 0, q = n - k;
        num -= com;
        com++;
        for (int i = 0; i < n; i++) {
            
            v[num] = true;
            list2.add(num);
               sum += num;
               
               
               for (int j = 1; j <= q; j++) {
                   v[num+j] = true;
                   list2.add(num+j);
            }
               num -= com;
        }
        
        Collections.sort(list2);
        for (int i = 1; i <= n*n; i++) {
            if(!v[i])
                list.add(i);
        }
        
        writer.println(sum);
        int x = 0, j = 0, s = 0;
        for (int i = 0; i < n; i++) {
            for (int l = 0; l < n; l++) {
                if(l >= k-1)
                    writer.printf("%d ", list2.get(j++));
                else
                    writer.printf("%d ", list.get(s++));
            }
            
            writer.println();
        }
        
        writer.flush();
    }
}

class Edge implements Comparable<Edge> {

    int to;
    int from;
    int cost;

    Edge(int a, int b, int c) {
        from = a;
        to = b;
        cost = c;
    }

    @Override
    public int compareTo(Edge t) {
        return t.cost - cost;
    }
}

class Pair implements Comparable<Pair>{

    long x;
    long y;
    
    Pair(long a, long b) {
        x = a;
        y = b;
    }

    @Override
    public boolean equals(Object o) {
        return x == ((Pair)o).x && y == ((Pair)o).y;
    }

    @Override
    public int hashCode() {
        return 1;
    }

    @Override
    public int compareTo(Pair t) {
        if(x <= t.x && y <= t.y)
            return 1;
        return -1;
    }
}

class Reader {

    static BufferedReader reader;
    static StringTokenizer tokenizer;

    public static int pars(String x) {
        int num = 0;
        int i = 0;
        if (x.charAt(0) == '-') {
            i = 1;
        }
        for (; i < x.length(); i++) {
            num = num * 10 + (x.charAt(i) - '0');
        }

        if (x.charAt(0) == '-') {
            return -num;
        }

        return num;
    }

    static void init(InputStream input) {
        reader = new BufferedReader(
                new InputStreamReader(input));
        tokenizer = new StringTokenizer("");
    }

    static void init(FileReader input) {
        reader = new BufferedReader(input);
        tokenizer = new StringTokenizer("");
    }

    static String next() throws IOException {
        while (!tokenizer.hasMoreTokens()) {
            tokenizer = new StringTokenizer(
                    reader.readLine());
        }
        return tokenizer.nextToken();
    }

    static int nextInt() throws IOException {
        return pars(next());
    }

    static long nextLong() throws IOException {
        return Long.parseLong(next());
    }

    static double nextDouble() throws IOException {
        return Double.parseDouble(next());
    }
}