#include
using namespace std;
int main()
{
int n;
cin>>n;
for(int i=1;i<=n;i++)
{
for(int j=1;j<=n;j++)
{
if(j==1 or j==n)
cout<<"*"<<" ";
else if(i==1 or i==n)
cout<<"*"<<" ";
else if(j==2 and (i==2 or i==n-1))
cout<<"*"<<" ";
else if(j==n-1 and (i==2 or i==n-1))
cout<<"*"<<" ";
else
{
cout<<" ";
}
}
cout<<endl;
}
return 0;
}