#include <iostream>
#include <cstdio>

#define ll long long
using namespace std;

int main()
{
  ll ms;
  scanf("%lld",&ms);

  ll ss = ms / 1000;
  ll s = ss % 60;

  ll m = ss / 60 % 60;

  ll h = ss / 60 / 60 % 24;


  printf("%02lld:%02lld:%02lld",h,m,s);
  return 0;
}