function minTime(machines, goal) {
  let min = 1, max = goal * Math.max(...machines)

  while (min < max) {
    let mid = parseInt((min + max) / 2)
    let prod = machines.reduce((prev, curr) => prev + parseInt(mid / curr), 0)
    if (prod < goal) min = mid + 1
    else max = mid
  }
  return min
}