import java.text.SimpleDateFormat;
import java.util.*;

class Main {
	static Scanner sc = new Scanner(System.in);
	public static void main(String[] args) {
		
		Calendar cl = Calendar.getInstance();
		cl.set(Calendar.HOUR_OF_DAY, 10);
		cl.set(Calendar.MINUTE, 0);
		cl.add(Calendar.MINUTE, sc.nextInt()*60/100);
		SimpleDateFormat sdf = new SimpleDateFormat("HH:mm");
		System.out.println(sdf.format(cl.getTime()));
		
	}
}