//11. Bitcoin "Mining"
function bitcoinMining(arr) {

  let workArr = arr

  let sumBitcoins = 0
  let sumLeva = 0
  let flagFirst = false
  let dayFirstBitcoin = 0
  //0, < не работи, ама защо?
  for (let i = 1; i <= workArr.length; i++) {

    if (i % 3 === 0)
      workArr[i - 1] *= 0.7

    sumLeva += workArr[i - 1] * 67.51

    if (sumLeva >= 11949.16) {
      if (!flagFirst) {
        flagFirst = true
        dayFirstBitcoin = i
      }
      let bitcoinTmp = ~~(sumLeva / 11949.16)
      sumBitcoins += bitcoinTmp
      sumLeva = sumLeva - bitcoinTmp * 11949.16
    }
  }
  console.log(`Bought bitcoins: ${sumBitcoins}`)
  if (flagFirst)
    console.log(`Day of the first purchased bitcoin: ${dayFirstBitcoin}`)
  console.log(`Left money: ${sumLeva.toFixed(2)} lv.`)
}
bitcoinMining0(
  [100, 200, 300]
)
bitcoinMining0(
  [50, 100]
)
bitcoinMining0(
  [3124.15, 504.212, 2511.124]
)

function bitcoinMining0(arr) {
  'use strict'

  let workArr = arr

  let sumBitcoins = 0
  let sumLeva = 0
  let flagFirst = false
  let dayFirstBitcoin = 0
  for (let i = 0; i < workArr.length; i++) {

    if ((i + 1) % 3 === 0)
      workArr[i] *= 0.7

    sumLeva += workArr[i] * 67.51

    if (sumLeva >= 11949.16) {
      if (!flagFirst) {
        flagFirst = true
        dayFirstBitcoin = i + 1
      }
      let bitcoinTmp = ~~(sumLeva / 11949.16)
      sumBitcoins += bitcoinTmp
      sumLeva = sumLeva - bitcoinTmp * 11949.16
    }
  }
  console.log(`Bought bitcoins: ${sumBitcoins}`)
  if (flagFirst)
    console.log(`Day of the first purchased bitcoin: ${dayFirstBitcoin}`)
  console.log(`Left money: ${sumLeva.toFixed(2)} lv.`)
}