#include<iostream>
#include<iomanip>
using namespace std;
int main()
{
long long int n;
long long int m;
long long int day;
long long int f;
day = 24 * 60 * 60;
cin >> n;
m = n / 1000;
f = m % day;
int shi = 0;
int feng = 0;
int miao = 0;
miao = f % 60;
shi = f / 3600;
feng = (f - shi * 3600) / 60;
miao = (f - shi * 3600) % 60;
cout << setw(2) << setfill('0') << shi << ":" << setw(2) << setfill('0') << feng << ":" << setw(2) << setfill('0') << miao;
return 0;
}