#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, k, sumk;
  cin >> n >> k;
  k--;
  int out[500][500];
  sumk = 0;
  int current = n * n;
  for (int i = 0; i < n; ++i) {
    for (int j = n - 1; j >= k; --j) {
      out[i][j] = current;
      if (j == k) {
        sumk += current;
      }
      current--;
    }
  }
  for (int i = 0; i < n; ++i) {
    for (int j = k - 1; j >= 0; --j) {
      out[i][j] = current;
      current--;
    }
  }
  cout << sumk << endl;
  for (int i = 0; i < n; ++i) {
    for (int j = 0; j < n; ++j) {
      cout << out[i][j] << " ";
    }
    cout << endl;
  }
  return 0;
}
