public static void Main()
double size1, size2, size3;
Console.WriteLine("size1, size2, size3");
size1=double.Parse(Console.ReadLine());
size2=double.Parse(Console.ReadLine());
size3=double.Parse(Console.ReadLine());
if((size1+size2>size3)&&(size1+size3>size2)&&(size2+size3>size1))
Console.WriteLine("yes");