#include<bits/stdc++.h>
using namespace std;
int main() {
	int x,a,b,c;
	cin>>x;
	a=x/3600;
	b=x%3600/60;
	c=x%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;
}