#include <iostream>
using namespace std;
int main() {
    int n; cin >> n;
    int A[n+1][n+1], x = 1;
    for (int i = 0; i < n/2; i++) {
        if (i % 2) {
            for (int j = n-1; j >= 0; j--) {
                A[i][j] = x++;
                A[i+n/2][(j+n/2)%n] = x++;
            }
        } else {
            for (int j = 0; j < n; j++) {
                A[i][j] = x++;
                A[i+n/2][(j+n/2)%n] = x++;
            }
        }
    }
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) cout << A[i][j] << ' ';
        cout << endl;
    }
}