import java.util.*;
public class Main {
	static Scanner sc = new Scanner(System.in);
	public static void main(String[] args) {
		int a = sc.nextInt()/10;
		int times = 600+a*6;
		int h = times/60;
		int m = times%60;
		String ans = String.valueOf(h)+":";
		if (m<10) {ans += "0";}
		ans += String.valueOf(m);
		System.out.println(ans);
	}
}