#include <iostream>
using namespace std;
int main(void) {
	
	int strana;
	int i;
	cout << " zadej cislo: ";
	cin >> strana;
	
	i = 1;
	
	while( i <= strana * strana )
	{
		if( (i-1) / strana % 2 == 0 )
		{
			cout <<  			 ( i -  (i-1)/strana*strana ) << " ";
		}else
		{
			cout << strana + 1 - ( i -  (i-1)/strana*strana ) << " ";
		}
		
		if( i % strana == 0)
		{
			cout << "\n";
		}
		i ++;
	}
}