using System;

public class Program

{

    public static void Main()

    {

        int q = Convert.ToInt32(Console.ReadLine());

            int w = Convert.ToInt32(Console.ReadLine());

            int e = Convert.ToInt32(Console.ReadLine());

            int sum;

            if(e==1)

        {      sum = q + w;}

            if(e==2)

          {    sum = q - w;}

            if(e==3)

           {   sum = q * w;}

            if(e==4)

          {    sum = q / w; }

            Console.WriteLine(sum);

    }

}