#include<cstdio>
#include<iostream>
using namespace std;

int main(){
	
	long long time=0;
	cin>>time;
	time=(time/1000)%(24*60*60);
	
	int h=time/(60*60);
	int m=(time-60*60*h)/60;
	int s=time-60*60*h-60*m;
	printf("%02d:%02d:%02d",h,m,s);

	return 0;
}