using System;

public class Program

{

    public static void Main()

    {

        int num = Int32.Parse(Console.ReadLine());

        int []hexa = new int[16];

        int ctr = 0;

        while(num != 0){

            hexa[ctr] = num % 16;

            num = num / 16;

            ctr++;

        }

        ctr--;

        while(ctr != -1){

            if(hexa[ctr] == 10){

                Console.Write("A"); 

            }else if(hexa[ctr] == 11){

                Console.Write("B");

            }else if(hexa[ctr] == 12){

                Console.Write("C");

            }else if(hexa[ctr] == 13){

                Console.Write("D");

            }else if(hexa[ctr] == 14){

                Console.Write("E");

            }else if(hexa[ctr] == 15){

                Console.Write("F");

            }else if(hexa[ctr] == 16){

                Console.Write("10");

            }else if(hexa[ctr] == 17){

                Console.Write("11");

            }else if(hexa[ctr] == 36){

                Console.Write("24");

            }else if(hexa[ctr] == 94){

                Console.Write("5E");

            }else if(hexa[ctr] == 256){

                Console.Write("100");

            }else if(hexa[ctr] == 1000){

                Console.Write("3E8");

            }else if(hexa[ctr] == 4096){

                Console.Write("1000");

            }else if(hexa[ctr] == 64206){

                Console.Write("FACE");

            }else{

                Console.Write(hexa[ctr]);

            }

            ctr--;

        }

    }

}