#include <bits/stdc++.h>
using namespace std;
int main() {
  int i, j, k, n;
  cin >> n;
  k = n / 2;
  for (i = 1; i <= n; i++) {
    cout << (i - 1) * k + 1;
    for (j = (i - 1) * k + 2; j <= i * k; j++) cout << " " << j;
    for (j = n * n - (i - 1) * k; j > n * n - i * k; j--) cout << " " << j;
    cout << endl;
  }
  return 0;
}
