public static void Main()
Console.WriteLine("Size bánh chưng");
int Number = Convert.ToInt32(Console.ReadLine());
for (int i=0;i<=Number;i++){
for(int j=0;j<=Number;j++){
Console.Write( ( (i==0) || (i==Number) || (i==(Number/2)) || (j==0) || (j==Number) || (j==i) || (j==Number/2) || (i+j==Number))?"*":" ");