using System;
 
namespace ConsoleApplication52
{
 class Program
 {
 static string[] chislo(int n)
 {
 int i;
 int b;
 int q;
 string[] s = new string[20];
 for (i = 0; n > 0; i++)
 {
 b = n;
 n = n / 16;
 q = b - n * 16;
 
 if (q > 9)
 {
 if (q == 10)
 s[i] = "A";
 if (q == 11)
 s[i] = "B";
 if (q == 12)
 s[i] = "C";
 if (q == 13)
 s[i] = "D";
 if (q == 14)
 s[i] = "E";
 if (q == 15)
 s[i] = "F";
 }
 else
 s[i] = Convert.ToString(q);
 }
 for (i = i - 1; i >= 0; i--)
 Console.Write(s[i]);
 return s;
 }
 static void Main()
 {
 int a = int.Parse(Console.ReadLine)));
 chislo(a);
 Console.ReadKey();
 }
 }
}