ChastOtDomashnata

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

namespace Domashna
{
	class Program
	{
		static void Main(string[] args)
		{
			double sum = 0;



			for (int i = 1; i <= 49; i++)
			{
				sum = Math.Sqrt(i) + sum;

			}
			Console.WriteLine(sum);
		}
	}
}