---

#include <iostream>

using namespace std;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    int n;
    if (cin >> n) {
        for (int i = 0; i < n; ++i) {
            for (int j = 0; j < n; ++j) {
                int val;
                if (i % 2 == 0) {
                    val = i * n + j + 1;
                }
                else {
                    val = i * n + (n - j);
                }

                cout << val << (j == n - 1 ? "" : " ");
            }
            cout << "\n";
        }
    }

    return 0;
}