#define _CRT_SECURE_NO_WARNINGS
#include<iostream>
#include<algorithm>

using namespace std;

int mass[113][113];
bool used[113][113];
int dx[4] = { 0,1,0,-1 };
int dy[4] = { 1,0,-1,0 };

int main()
{
	int n;
	cin >> n;
	int d = 0;
	int e = 1;
	int x = 1, y = 1;
	while (e < n * n)
	{
		used[x][y] = 1;
		if (0 == x + dx[d] || x + dx[d] > n || y + dy[d] == 0 || y + dy[d] > n || used[x + dx[d]][y + dy[d]])
		{
			d++; d = d % 4;
		}
		x += dx[d];
		y += dy[d];
	}
}