;-)

function solve(input) {
    let efficiencyOne = Number(input[0]) // count of people emplyee one can help per hour
    let efficiencyTwo = Number(input[1]) // count of people emplyee two can help per hour
    let efficiencyThree = Number(input[2]) // count of people emplyee three can help per hour
    let peopleCount = Number(input[3]) // total count of people
    let customersPerHourTotal = efficiencyOne + efficiencyTwo + efficiencyThree
    // let hoursNeeded = Math.round(peopleCount/customersPerHourTotal)
    let totalHoursWorked = 0;

    while (peopleCount > 0) {
        totalHoursWorked++;

        if (totalHoursWorked % 4 == 0) {
            //  totalHoursWorked++
        } else {
            peopleCount -= customersPerHourTotal;
            if (peopleCount <= 0) {
                break;
            }
        }
    }

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