public static void Main()
Console.WriteLine("day/month/year:");
d=int.Parse(Console.ReadLine());
m=int.Parse(Console.ReadLine());
y=int.Parse(Console.ReadLine());
if ((((d>0&&d<=31&&(m==1||m==2 ||m==3 ||m==5 ||m==7|| m==8||m==10 ||m==12))||
(d>0&&d<=30&&(m==4||m==6 ||m==9 ||m==11))||
( d ==29 && m==2&&y%4==0))))
{Console.WriteLine(d+"/"+m+"/"+y);
Console.WriteLine("Valid");}
{Console.WriteLine(d+"/"+m+"/"+y);
Console.WriteLine("Wrong");}}