#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, k;
  cin >> n >> k;
  cout << (6 * n - 1) * k << "\n";
  for (int i = 0; i < n; ++i) {
    cout << (6 * i + 1) * k << ' ' << (6 * i + 2) * k << ' ' << (6 * i + 3) * k
         << ' ' << (6 * i + 5) * k << "\n";
  }
  return 0;
}
