using System;
using System.IO;
using System.Linq;

namespace AtCoder {
	class Program {
		public static void Main(string[] args) {
			Console.SetOut(new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false });

			long[] input = Console.ReadLine().Split(' ').Select(long.Parse).ToArray();
			double left = input[0] + input[1] + (Math.Sqrt(input[0] * input[1]) * 2.0);
			long right = input[2];
			if (left < right) {
				Console.WriteLine("Yes");
			} else {
				Console.WriteLine("No");
			}

			Console.Out.Flush();
		}
	}
}
