public static void Main()
int m = int.Parse(Console.ReadLine());
b=(((d*100000)+x*100)+v);
if ((m < 0) && (m / 100000) != 0 && (v>99 || v<99))
Console.WriteLine("invalid number");
Console.WriteLine("invalid month");
if (((x == 1 || x == 3 || x == 5 || x == 7 || x == 8 || x == 10 || x == 12) && d < 1 || d > 31) )
Console.WriteLine("Invalid day");
if (x == 2 && m/4==0 && d>29 || d<0)
Console.WriteLine("Invalid day");
if ((x == 4 || x == 6 || x == 9 || x == 11) && d < 1 || d > 30)
Console.WriteLine("Invalid day");