#include <iostream>
#include <vector>
#include <algorithm>
#include <iomanip>

#define REP(i, a, b) for (int i = int(a); i < int(b); i++)
#define dump(s) cerr << __LINE__ << "\t:" << #s << " = " << (s) << endl
    
using namespace std;

int main () {
    int a;
    cin >> a;
    int tm = (600 + a / 10 * 6) % 1440;
    cout << setw(2) << setfill('0') << tm / 60 << ':' << setw(2) << setfill('0') << tm% 60 << endl;
    
    return 0; 
}