#include "pch.h"
#include <iostream>
using namespace std;

int main()
{
	int n;
	cin >> n;
	int rows = 1;
	for (int i = 1; i <= n * n; i+=n)
	{

		if (rows % 2 != 0)
		{
			for (int p = i; p <= i+n-1; p++)
			{
				cout << p;
				if (p == i+n-1)
				{
					cout << endl;
					rows++;
				}
			}
		}
		else
		{
			for (int q = i+n-1; q >= i; q--)
			{
				cout << q;
				if (q == i)
				{
					cout << endl;
					rows++;
				}
			}
		}
	}
	return 0;
}