#include<bits/stdc++.h>
#define rep(i, x) for(ll i = 0; i < x; i++)
#define rep2(i, x) for(ll i = 1; i <= x; i++)
#define all(a) (a).begin(),(a).end()
using ll = long long;
using ld = long double;
const ll INF = 10000000000000000;
using namespace std;
signed main() {
    ll n; cin >> n; n /= 10; n *= 6; ll a = 10, b = n;
	while (b > 60) { a++; b -= 60; }
	if (b <= 9) { cout << a << ":0" << b << endl; }
	else { cout << a << ':' << b << endl; }
	return 0;
}