import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Scanner;
import java.util.TimeZone;

 
Scanner scan = new Scanner(System.in);
        System.out.print("");

        int num = scan.nextInt();
        scan.close();

        TimeZone tz = TimeZone.getTimeZone("UTC");
            SimpleDateFormat df = new SimpleDateFormat("HH:mm:ss");
        df.setTimeZone(tz);
        String time = df.format(new Date(num * 1000));
        System.out.println(time);