#include<iostream>
using namespace std;
int main()
{
    int n,a,b,c;
    cin >>n;
    a=n/60/60;
    b=n%3600/60;
    c=n%60;
    if(a<10) cout <<"0" <<a <<":";
    else cout <<a <<":";
    if(b<10) cout <<"0" <<b <<":";
    else cout <<b <<":";
    if(c<10) cout <<"0" <<c;
    else cout <<c;
    return 0;
}