function solve(input) {

    let firstEmployee = input.shift();
    let secondEmployee = input.shift();
    let thirdEmployee = input.shift();
    let totalPeople = input.shift();

    let totalPeoplePerHour = firstEmployee + secondEmployee + thirdEmployee;

     let totalHour = Math.ceil(totalPeople / totalPeoplePerHour);


     if (totalHour > 3) {
         totalHour += Math.floor(totalHour / 3)
     }


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

}