---

using System;

class Program
{
    static void Main()
    {
        Console.Write("Введите x (в радианах): ");
        double x = Convert.ToDouble(Console.ReadLine());

        // Номер 16
        double ctg = 1.0 / Math.Tan(x / 3.0);
        double result16 = ctg + 0.5 * Math.Sin(x);
        Console.WriteLine($"16. F(x) = ctg(x/3) + 1/2*sin(x) = {result16}");

        // Номер 17
        double result17 = 0.5 * Math.Sin(x / 4.0) + 1.0;
        Console.WriteLine($"17. F(x) = 1/2*sin(x/4) + 1 = {result17}");
    }
}