#include <bits/stdc++.h>
using namespace std;
int a[400][400];
int main() {
  int n;
  cin >> n;
  long long k = n * n;
  for (int j = 1; j <= n; j++) {
    if (j % 2 != 0) {
      for (int i = 1; i <= n; i++) {
        a[i][j] = k--;
      }
    } else {
      for (int i = n; i >= 1; i--) {
        a[i][j] = k--;
      }
    }
  }
  for (int i = 1; i <= n; i++) {
    for (int j = 1; j <= n; j++) {
      cout << a[i][j] << " ";
    }
    cout << endl;
  }
  return 0;
}
