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using System;
namespace Example
{
    class Program
    {
        static void Main()
        {
            Console.WriteLine("a,b,c:= ");
            int a = int.Parse(Console.ReadLine());
            int b = int.Parse(Console.ReadLine());
            int c = int.Parse(Console.ReadLine());
            string result = ( (a > b + c) || (b > a + c) || (c > b + a) ) ? "No": "Yes";
            Console.WriteLine(result);
        }
    }
}