// This is a CSharp program 
using System;
 
public class Program
{
    public static void Main()
    {
        // Дано
        double x1 = 2.6;
        double x2 = 2.8;
        double a = 3.0;
        double b = 6.0;
        double c = 0.0;
 
        // Обчислення
        c = (Math.Pow(x1, 2) + Math.Pow(x2, 2) - a) / (x1 + b);
 
        // Виведення результату
        Console.WriteLine("Final result c = " + c.ToString("F4"));
    }
}

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