#include<bits/stdc++.h>
using namespace std;
int n;
int main(){
	cin>>n;
	for(int i=1;i<=n;i++){	
		for(int j=1;j<=n;j++){
			if(i==1||i==n||j==1||j==n){
				cout<<"*";	
			} else{ cout<<" ";
      				
			}
	  		
		}
		
		cout<<endl;
	}
	

	return 0;
}

/**************************************************************
	Problem: 1492
	User: chenxuanyi
	Language: C
	Result: Compile Error
****************************************************************/