#include <iostream>
using namespace std;
int main()
{
int n, r;
char c;
do {
cout << "\nNumero (3-20): "; cin >> n;
if (n < 3 || n > 20)
cout << "\nDebe estar en el rango de 3 a 20" << endl;
} while (n < 3 || n > 20);
if (n % 2 == 0)
{
r = 2; c = '$';
}
else
{
r = 3; c = '@';
}
for (int i = 0; i < n * r; i++)
cout << c << " ";
cout << endl;
return 0;
}