#include <bits/stdc++.h>
using namespace std;

int main(){
	int n;
	scanf("%d",&n);
	int num=1;
	int a[20][20]={{0}};
	int top=0,bottom=n-1,left=0,right=n-1;
	while(num<=n*n){
		for(int i=top;i<=bottom;i++)
			a[i][left]=num++;
		left++;
		for(int i=left;i<=right;i++)
			a[bottom][i]=num++;
		bottom--;
		for(int i=bottom;i>=top;i--)
			a[i][right]=num++;
		right--;
		for(int i=right;i>=left;i--)
			a[top][i]=num++;
		top++;	
	} 
	for(int i=0;i<n;i++){
		for(int j=0;j<n;j++){
			printf("%-3d ",a[i][j]);
		}
		printf("\n");
	}
	return 0;	
}