#include <iostream>
#include <string>
#include <cstdio>
#include <cmath>

using namespace std;

int main()
{
   int n,a,b,c;
   cin>>n;
   a=n/3600;
   n%=3600;
   b=n/60;
   n%=60;
   c=n;
   cout<<a<<':'<<b<<':'<<c<<endl;

    return 0;
}