#include <iostream>
using namespace std;
int main(void)
{

	int X;
	cout << " zadej stranu: ";
	cin >> X;

	int pocet;
	pocet = 0;
	while( pocet < X*X)
	{	
		//cout <<  pocet % X + 1 << " ";
		//cout << (pocet/X%2)*(X+1)  <<" ";
		//cout << (pocet/X%2)*(X+1) - (pocet % X + 1)<< " ";
		cout << (pocet/X%2)*(X+1) - (2*(pocet/X%2) - 1) * (pocet % X + 1)<< " ";
			
		pocet = pocet + 1;
		if(pocet % X == 0)
		{
			cout << "\n";
		}
	}

}