#include<bits/stdc++.h>
using namespace std;
int main(){
    int n,i,j;
    cin>>n;
    for(i=1;i<=n;i++){
        for(j=1;j<=n-i;j++){
            cout<<"*";
        }
        for(j=1;j<=i*2-1;j++){
            cout<<"@";
        }
        for(j=1;j<=n-i;j++){
            cout<<"*";
        }
        
    }
}
/**************************************************************
	Problem: 1494
	User: chenmingyu
	Language: C++
	Result: Wrong Answer
****************************************************************/