#include <iostream>
#include <algorithm>
using namespace std;
 
int main() {
 	 cout << "Enter the number" ; 
	 int n ;
	 cin >> n ; 
 
	 if(n%2 == 0)
	 	 cout << "not allowed" ;
 
	 if(n == 1 || n <= -1){
	 	cout << "not allowed"; 
	 }
 
	 for(int i = n ; i >= 1 ; i--){
	 	for(int j = 1 ; j <= i ;j++ ){
	 		if(j == 1 || j == i || i == n){
	 			cout << "@" ;
	 		}else{
	 			cout << " "; 
	 		}
	 	}
	 	cout << endl ; 
	 }
 
	return 0;
}

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

NA==

4