#include <bits/stdc++.h>   using namespace std;   const int INF = 1 << 29;   double tick() {     static clock_t oldticks;     clock_t newticks = clock();     double diff = 1.0 * (newticks - oldticks) / CLOCKS_PER_SEC;     oldticks = newticks;     return diff;   }   int n, k;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     cin >> n >> k;     cout << (6 * n - 1) * k << endl;     for (int i = 0; i < n; i++) {       cout << k * (6 * i + 1) <<     << k * (6 * i + 3) <<     << k * (6 * i + 4)            <<     << k * (6 * i + 5) << endl;     }     return 0;   }   