#include <iostream>
#include <cstring>
#include <algorithm>

using namespace std;

typedef long long LL;

int main()
{
    LL nm;
    LL ss, mm, hh;
    scanf("%lld", &nm);
    LL sum = nm / 1000;
    //print("%l64d", sum);
    ss = sum % 60;

    sum = sum / 60;
    mm = sum % 60;

    sum = sum / 60;
    hh = sum % 24;

    if (hh < 10) printf("0%lld", hh);
    else printf("%d", hh);

    if (mm < 10) printf(":0%lld", mm);
    else printf(":%d", mm);

    if (ss < 10) printf(":0%lld", ss);
    else printf(":%d", ss);

    return 0;
}