//ITP1_1_D:   Watch
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

class Main {

	public static void main(String[] args) throws IOException {
        
        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
        
         int sec = Integer.parseInt(in.readLine());
         
         int hh=sec/3600;
         int mm=(sec%3600)/60;
         int ss=sec%60;
         
         System.out.println(hh+":"+mm+":"+ss);
        
	}
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz