#include <iostream>
using namespace std;
//pouze 2 prom. celkem
//odpovida zadani pouze pro licha cisla X
int main()
{
	int X;
	cin >> X;
	int i = 0; //pocitadlo cisel
	

	while ( X>=1 )
	{	
		i ++;
		if( X%2 == 1 ) 
		{
			cout << i << " ";
		}
		else
		{
			cout << X-i + 1 << " ";
		}
		if(i == X)
		{	
			cout << "\n";
			X --; 
			i = 0;
		}
		
	}
}