#include<bits/stdc++.h> 
using namespace std;
    int a[30][30],n;
    int main(){
    cin>>n;
    int i,j,tot;
    i=1,j=n;a[i][j]=tot=1;
    while(tot<n*n)
    {
        while(i+1<=n&&!a[i+1][j])a[++i][j]=++tot;
        while(j-1>=1&&!a[i][j-1])a[i][--j]=++tot;
        
        while(i-1>=1&&!a[i-1][j])a[--i][j]=++tot;
        while(j+1<=n&&!a[i][j+1])a[i][++j]=++tot;
    }
    for(int i=1;i<=n;i++)
    {
        for(int j=1;j<=n;j++)
        cout<<setw(4)<<a[i][j];
        cout<<"\n";
    }
    return 0;
}

#include<bits/stdc++.h>
using namespace std;
int a[30][30],n;
int main(){
cin>>n;
int i,j,tot;
i=1,j=n;a[i][j]=tot=1;
while(tot<n*n)
{
while(i+1<=n&&!a[i+1][j])a[++i][j]=++tot;
while(j-1>=1&&!a[i][j-1])a[i][--j]=++tot;

while(i-1>=1&&!a[i-1][j])a[--i][j]=++tot;
while(j+1<=n&&!a[i][j+1])a[i][++j]=++tot;
}
for(int i=1;i<=n;i++)
{
for(int j=1;j<=n;j++)
cout<<setw(4)<<a[i][j];
cout<<"\n";
}
return 0;
}