知识点：运算 

#include <iostream>
using namespace std;

int main() {
    int n = 0;
    int time = 0;
    int per = 12;
    int up_time = 2;
    int down_time = 2;
    int up_down = 4;

    cin >> n;

    time = n / per * up_down + up_time;

    cout << time << endl;

    return 0;
}