#include <iostream>
using namespace std;
int main(void) {
	
	int strana;
	int i;
	int delta;
	int c;
	cout << " zadej cislo: ";
	cin >> strana;
	
	delta = 1; c = 1; i = 1;
	
	while( i <= strana * strana )
	{
		cout << c << " ";

		if( i % strana == 0)
		{
			cout << "\n";
			delta = -delta;
		}
		else
		{
			c = c + delta;
		}
		i = i + 1;
	}
}