#include <bits/stdc++.h>
using namespace std;
int main(){
    int n;
    cin>>n;
    for(int i=1;i<=n;i++){
        for(int j=1;j<=n;j++){
            if(i==n||j==n||j==1||i==1) cout<<"*";
            else cout<<" ";
        } 
        cout<<endl;
    }
}
/**************************************************************
	Problem: 1492
	User: wngjinming
	Language: C++
	Result: Accepted
	Time:14 ms
	Memory:2072 kb
****************************************************************/