import java.util.Scanner;

 public class Solution
 {
     public static void main(String[] args)
     {
         Scanner input = new Scanner(System.in);

         System.out.print("Enter an integer: ");
         int number = input.nextInt();

         input.close();

         String[] charOfNumber = {"0", "1", "2", "3", "4", "5", "6", "7", "8", "9",
             "A", "B", "C", "D", "E", "F"};

         String hexString = "";

         while(number > 0)
         {
             hexString = charOfNumber[number % 16] + hexString;
             number /= 16;
         }

         System.out.println(hexString);
     }
 }