#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(int)(n);i++)
using namespace std;
using ll = long long ;
using P = pair<int,int> ;
using pll = pair<long long,long long>;
constexpr int INF = 1e9;
constexpr long long LINF = 1e17;
constexpr int MOD = 1000000007;
constexpr double PI = 3.14159265358979323846;

int main(){
    int a;
    cin >> a;
    int ans = (3*a)/5;
    int hour = 10 + ans / 60;
    int minu = ans % 60;
    if(0 <= minu && minu <= 9) cout << hour << ":0" << minu << endl;
    else cout << hour << ":" << minu << endl;
    return 0;
}