01. SoftUni Reception

#include <iostream>

using namespace std;

int main() {
    int first, second, third, students, counter = 1, hours = 0;
    cin >> first >> second >> third >> students;

    while (students > 0) {
        students -= first + second + third;
        hours += (counter % 3 == 0 && students > 0 ? 2 : 1);
        counter += 1;
    }

    cout << "Time needed: " << hours << "h.\n";
    return 0;
}