static void Main(string[] args)
Console.Write("Nhap vao a:=");
a = int.Parse(Console.ReadLine());
Console.Write("Day la chu nhat");break;
Console.Write("Day la thu hai"); break;
Console.Write("Day la thu ba"); break;
Console.Write("Day la thu tu"); break;
Console.Write("Day la thu nam");break;
Console.Write("Day la thu sau");break;
Console.Write("Day la thu bay");break;
Console.Write("Ko la ngay trong tuan");break;