include[HTML_REMOVED]

using namespace std;

int main()
{
long long n;
cin>>n;
n/=1000;
long long h=0,m=0,s=0;
h=n/60/60%24;
m=n/60%60;
s=n%60;
if(h<10)cout<<‘0’;
cout<<h<<’:’;
if(m<10)cout<<‘0’;
cout<<m<<’:’;
if(s<10)cout<<‘0’;
cout<<s;
}