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