Q1

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

namespace ConsoleApplication3
{
    class Program
    {
        static void Main(string[] args)
        {
            double a, b, c;
            Console.WriteLine("Enter the number");
            a = Convert.ToDouble(Console.ReadLine());
            b = Convert.ToDouble(Console.ReadLine());
            c = Convert.ToDouble(Console.ReadLine());

            Console.WriteLine(S(a,b,c));

        }
        static double S(double a, double b, double c)
        {
            double s = 0;
            if ((a < b && b < c) || (a > b && a < c))
            {
                s = 0.5 * a * b;
            } else {
                if (a < b && a > c)
                {
                    s = 0.5 * a * c;
                } else
                {
                    s = 0.5 * b * c;
                }
            }
            return s;
        }
    }
}