Problem: Dreamoon likes to play with sets, integers and <image>. <image> is defined as the largest positive integer that divides both a and b.

Let S be a set of exactly four distinct integers greater than 0. Define S to be of rank k if and only if for all pairs of distinct elements si, sj from S, <image>.

Given k and n, Dreamoon wants to make up n sets of rank k using integers from 1 to m such that no integer is used in two different sets (of course you can leave some integers without use). Calculate the minimum m that makes it possible and print one possible solution.

Input

The single line of the input contains two space separated integers n, k (1 ≤ n ≤ 10 000, 1 ≤ k ≤ 100).

Output

On the first line print a single integer — the minimal possible m. 

On each of the next n lines print four space separated integers representing the i-th set.

Neither the order of the sets nor the order of integers within a set is important. If there are multiple possible solutions with minimal m, print any one of them.

Examples

Input

1 1


Output

5
1 2 3 5


Input

2 2


Output

22
2 4 6 22
14 18 10 16

Note

For the first example it's easy to see that set {1, 2, 3, 4} isn't a valid set of rank 1 since <image>.

Solution (in JAVA):

Solution:
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.math.BigDecimal;
import java.util.*;

public class CF272_1_B {
  public static void main(String[] args) throws Exception {

    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    String input = br.readLine();
    String[] ss = input.split(" ");
    int n = Integer.parseInt(ss[0]);
    int k = Integer.parseInt(ss[1]);

/*
    int n = 113;
    int k = 97;
*/

    System.out.println(k*(5+6*(n-1)));
    for (int j = 0; j < n; j++) {
      System.out.print(k*(1+6*j));
      System.out.print(" ");
      System.out.print(k*(2+6*j));
      System.out.print(" ");
      System.out.print(k*(3+6*j));
      System.out.print(" ");
      System.out.print(k*(5+6*j));
      System.out.println();
    }

  }

}