#include <bits/stdc++.h>
using namespace std;
int arr[503][503];
int main() {
  int n, k;
  cin >> n >> k;
  int p = 1;
  for (int i = 1; i <= n; i++) {
    for (int j = 1; j < k; j++) {
      arr[i][j] = p++;
    }
  }
  for (int i = 1; i <= n; i++) {
    for (int j = k; j <= n; j++) {
      arr[i][j] = p++;
    }
  }
  int sum = 0;
  for (int i = 1; i <= n; i++) {
    sum += arr[i][k];
  }
  cout << sum << endl;
  for (int i = 1; i <= n; i++) {
    for (int j = 1; j <= n; j++) {
      cout << arr[i][j] << ' ';
    }
    cout << endl;
  }
  return 0;
}
