1 import java.util.Scanner;
 2 
 3 public class Main {
 4     public static void main(String[] args){
 5         Scanner sc=new Scanner(System.in);
 6         int n=sc.nextInt();
 7 
 8         int h = n / 3600 ;            //小时
 9         int m = n % 3600 / 60 ;        //分钟
10         int s = n % 60;                //秒
11         System.out.println(h+":"+m+":"+s);    
12     }
13 }