using System;

public class Program

{

    public static void Main()

    {

        string i = "1";

        char I = Convert.ToChar(i);

        string o = "0";

        char O = Convert.ToChar(o);

        Console.WriteLine("Please enter an 8-bit binary number");

        string input = Console.ReadLine();

        if (input.Length < 8){

            Console.WriteLine("The input MUST be 8 digits.");

        }

        else{

            int result = 0;

            if (input[0] == I){

                result = (result + 128);

            }

            if (input[1] == I){

                result = (result + 64);

            }

            if (input[2] == I){

                result = (result + 32);

            }

            if (input[3] == I){

                result = (result + 16);

            }

            if (input[4] == I){

                result = (result + 8);

            }

            if (input[5] == I){

                result = (result + 4);

            }

            if (input[6] == I){

                result = (result + 2);

            }

            if (input[7] == I){

                result = (result + 1);

            }

            Console.WriteLine(result);

        }

    }

}