using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

​

namespace AreaOfFigures

{

    public class Program

    {

        public static void Main(string[] args)

        {

            var text = Console.ReadLine();

            var num1 = double.Parse(Console.ReadLine());

            var num2 = double.Parse(Console.ReadLine());

​

            double result = 0;

            if (text == "square")

            {

                result = num1 * 5;

            }

            else if (text == "rectangle")

            {

                result = num1 * num2;           

            }

            else if (text == "triangle")

            {

                result = num1 * num2 / 2;

            }

            Console.WriteLine(Math.Round(result));

​

        }

    }

}

​