#include <bits/stdc++.h>
// #include <boost/multiprecision/cpp_int.hpp>
using namespace std;
// using bigint = boost::multiprecision::cpp_int;

template <typename T> using min_priority_queue = priority_queue<T,vector<T>,greater<T>>;

random_device seed_gen;
mt19937 engine(seed_gen());

int64_t get_time_ns(){
    struct::timespec t;
    clock_gettime(CLOCK_MONOTONIC, &t);
    return t.tv_sec * int64_t(1'000'000'000) + t.tv_nsec;
}

int main() {
    int a;
    cin >> a;
    int m = (a / 10 * 6 + 10 * 60) % (24 * 60);
    int h1 = m / 600;
    int h2 = m / 60 % 10;
    int m1 = m / 10 % 6;
    int m2 = m % 10;
    cout << h1 << h2 << ":" << m1 << m2 << endl;
    return 0;
}