#include <bits/stdc++.h>   using namespace std;   long long n, m, k, x = 1;   int main() {     ios::sync_with_stdio(false);     cin.tie(0);     cout.tie(0);     cin >> n >> k;     m = k * (5 + (n - 1) * 6);     cout << m << endl;     while (n--) {       cout << x * k <<     << (x + 1) * k <<     << (x + 2) * k <<                << (x + 4) * k << endl;       x += 6;     }     return 0;   }   