using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication3
{
    class Program
    {
        static void Main(string[] args)
        {

            int a = int.Parse(Console.ReadLine());
            int b = int.Parse(Console.ReadLine());
            int c = int.Parse(Console.ReadLine());


            int valid = 0;


            if ((a + b) > c)
            {
                if ((b + c) > a)
                {
                    if ((a + c) > b) //If a+b>c and a+c>b and b+c>a then it is valid
                    {
                        valid = 1;
                    }
                }
            }

            if (valid == 1)
            {
                Console.WriteLine("Triangle is valid.\n");
            }
            else
            {
                Console.WriteLine("Triangle is not valid.\n");
            }
        }
    }
}