#include <bits/stdc++.h>
#pragma comment(linker, "/STACK:1024000000,1024000000")
using namespace std;
const int maxn = 1000000;
int ans[maxn][6];
int main() {
  int n, k;
  scanf("%d%d", &n, &k);
  int m = 0;
  int cur = 0;
  for (int i = 1;; i++) {
    if (i % 2) {
      m = i + 4;
      ans[++cur][1] = i;
      ans[cur][2] = i + 1;
      ans[cur][3] = i + 2;
      ans[cur][4] = i + 4;
      i = i + 5;
    } else {
      i++;
    }
    if (cur == n) break;
  }
  printf("%d\n", m * k);
  for (int i = 1; i <= n; i++) {
    for (int j = 1; j <= 4; j++) {
      printf("%d", ans[i][j] * k);
      if (j != 4) cout << ' ';
    }
    cout << endl;
  }
}
