function solve(input = []) {
  let emp1Eff = +input.shift();
  let emp2Eff = +input.shift();
  let emp3Eff = +input.shift();
  let people = +input.shift();
  let neededHours = 0;
  let answerPerHour = emp1Eff + emp2Eff + emp3Eff;

  while (people > 0) {
    people -= answerPerHour;
    neededHours++;

    if (neededHours % 4 === 0) {
      neededHours++;
    }
  }

  console.log(`Time needed: ${neededHours}h.`);
}