#include <bits/stdc++.h>
using namespace std;
#define accelerate ios::sync_with_stdio(false),cin.tie(0),cout.tie(0)
#define endl "\n";
#define mod 12345
#define ll long long
#define PII pair<int,int>
#define INF 0x3f3f3f3f
const int N=1e5+10;
ll n,m,k,x,y,T;
ll a[N];
ll pre[N];
int main(){
	accelerate;
	cin>>x;
	printf("%02d:%02d:%02d",x/3600,x/60%60,x%60);
	//cout<<<<":"<<<<":"<<;
	return 0;
}