#include<iostream>
#include<cstdio>
using namespace std;
int main(){
int N,hour,min,sec;
cin >> N;
hour = N/3600; N = N % 3600;//此时N已经在3600以内
min = N/60; N = N % 60; //此时N已经在60以内
sec = N;
printf("%d:%d:%d",hour,min,sec);
return 0;
}