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