startup

while true do
  cost = 48
  term.clear()
  term.setCursorPos(1,1)
  print("How many do you want?")
  amount = read()
  amount = tonumber(amount)
  money = amount * cost
  if amount > 16 then
    print("Too many to buy")
  elseif amount == 0 then
    print("You can't buy zero of this item")
  elseif amount == 16 or amount < 16 then
    print("The total for the "..amount.." items is: "..money)
    print("Please enter your Iron Nuggets")
    turtle.select(1)
    io.read()
    s1 = turtle.getItemCount(1)
    s2 = turtle.getItemCount(2)
    s3 = turtle.getItemCount(3)
    s4 = turtle.getItemCount(4)
    s5 = turtle.getItemCount(5)
    s6 = turtle.getItemCount(6)
    s7 = turtle.getItemCount(7)
    s8 = turtle.getItemCount(8)
    s9 = turtle.getItemCount(9)
    s10 = turtle.getItemCount(10)
    s11 = turtle.getItemCount(11)
    s12 = turtle.getItemCount(12)
    s13 = turtle.getItemCount(13)
    s14 = turtle.getItemCount(14)
    s15 = turtle.getItemCount(15)
    s16 = turtle.getItemCount(16)
    sAll1 = s1 + s2 + s3 + s4
    sAll2 = s5 + s6 + s7 + s8
    sAll3 = s9 + s10 + s11 + s12
    sAll4 = s13 + s14 + s15 + s16
    sAll = sAll1 + sAll2 + sAll3 + sAll4
    sAll = tonumber(sAll)
    if sAll == money then
      turtle.back()
      turtle.back()
      turtle.back()
      for i = 1,16 do
        turtle.select(i)
        turtle.dropDown()
      end
      turtle.forward()
      turtle.forward()
      turtle.select(1)
      turtle.suckDown(amount)
      turtle.forward()
      turtle.drop(amount)
      print("Thank you for coming to The Zygro Store!")
    elseif sAll ~= amount then
      print("You never gave us the right amount and for that you have to die")
      rednet.send(2243, "kill")
    end
  end
end