#include <iostream>
using namespace std;

int main(){
    
    int n;
    cin >> n;
    
    for(int i = 0 ; i < n ; i++){
        if(i == 0 or i == (n-1)){
            for(int j = 0; j < n; j++)
                cout << "*";
        }
        else{
            for(int z = 0; z < n; z++){
                if(z == 0 or z == (n-1))
                    cout << "*";
                else
                    cout << " ";
            }
        }

        cout << "\n";
    }




    return 0;
}