function solve(arr) {


    let firstEmployee = Number(arr.shift());
    let secondEmployee = Number(arr.shift());
    let thirdEmployee = Number(arr.shift());
    let totalPeople = Number(arr.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.`);

}