#include<bits/stdc++.h>
using namespace std;
int main()
{
	int n;
	cin>>n;
	int a=n/3600;
	int b=n%3600/60;
	int c=n%3600%60;
	if(a>=10)
	{
		cout<<a<<":";	
	}
	else
	{
		cout<<"0"<<a<<":";	
	}
	if(b>=10)
	{
		cout<<b<<":";
	} 
	else
	{
		cout<<"0"<<b<<":";
	}
	if(c>=10)
	{
		cout<<c;
	}
	else
	{
		cout<<"0"<<c;
	}
}