import java.util.*;
public class Main {
	static Scanner sc = new Scanner(System.in);
	public static void main(String[] args) {
		int a = sc.nextInt();
		a = 60*a/100;
		int time = 600+a;
		int h = time/60;
		int m = time%60;
		if (m<10) {System.out.println(h+":0"+m);}
		else {System.out.println(h+":"+m);}
	}
}