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