using System;

namespace Methods
{
    class Program
    {
        static void Main(string[] args)
        {

            string command = Console.ReadLine();
            decimal a = decimal.Parse(Console.ReadLine());
            decimal b = decimal.Parse(Console.ReadLine());
            switch (command)
            {
                case "add":
                    Console.WriteLine(Add(a, b));
                    break;
                case "multipy":
                    Console.WriteLine(multiply(a, b));
                    break;
                case "divide":
                    Console.WriteLine(divide(a, b));
                    break;
                case "subtract":
                    Console.WriteLine(sub(a, b));
                    break;
            }
        }

        static decimal sub(decimal a, decimal b)
        {
            return a - b;
        }

        static decimal divide(decimal a, decimal b)
        {
            return a / b;

        }

        static decimal multiply(decimal a, decimal b)
        {
            return a * b;
        }

        static decimal Add(decimal a, decimal b)
        {
            return a + b;
        }
    }
}