#include <cstdio>
#include <iostream>
using namespace std;
                         
int main()
{
	int n,a,b,c;
	cin>>n;
    a=n/3600;
    b=(n-a*3600)/60;
    c=n-3600*a-60*b;
    printf("%02d:%02d:%02d",a,b,c);
	return 0;
 }