1 import java.util.*;
 2 public class Main {
 3     public static void main(String[] args) {
 4         int n = new Scanner(System.in).nextInt();
 5         int i,j,k;
 6         i = n/3600;
 7         j = (n%3600)/60;
 8         k = (n%3600)%60;
 9         System.out.println(i+":"+j+":"+k);
10     }
11 }