using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace _4_лаба_сумма_ряда_1_семестр_
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void label1_Click(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            const double eps = 0.00001;
            double x;
            double summ = 0.0;
            x = Convert.ToDouble(textBox1.Text);
            double j = ((14 * x * x) / (27));
            for (Int32 n=2; eps <= j && n<=14; n++)
            {
                j = ((14 * x * x) / (27 * n));
                summ = summ += j;
            }
            label3.Text = Convert.ToString(summ);
        }
    }
}