#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  int p = 1;
  int diagjump = n + 1;
  for (int i = 1; i <= n; i++) {
    p = i;
    for (int j = 1; j <= n; j++) {
      cout << p << " ";
      if (p == n * j)
        p++;
      else
        p += diagjump;
    }
    cout << endl;
  }
  return 0;
}
