--Master
rednet.open("right")
times = 0
function Pos()
  fsp = io.open("Position", "w")
  fsp:write("Position = "..[["]]..Position..[["]])
  fsp:close()
end
if fs.exists("Position") then
  dofile("Position")
else
  write("How many computers am I looking after? ")
  Position = tonumber(read())
end
sleep(1)
rednet.broadcast("Changeover")
print("Changeover!")
Hos = 0
repeat
  local ID, Msg = rednet.receive()
  if Msg == "Changedover!" then
    Hos = Hos+1
    print("Changeover callbacks = "..Hos)
  end
until Hos == Position
print("Changedover!")
while true do
  if turtle.forward() then
    if times < 50 then
      rednet.broadcast("Heave!")
      times = times+1
      Hos = 0
      repeat
        local ID, Msg = rednet.receive()
        if Msg == "Ho!" then
          Hos = Hos+1
        end
      until Hos == Position
    else
      rednet.broadcast("Changeover")
      times = 0
      Hos = 0
      repeat
        local ID, Msg = rednet.receive()
        if Msg == "Changedover!" then
          Hos = Hos+1
        end
      until Hos == Position
      sleep(0.2)
      rednet.broadcast("Heave!")
            Hos = 0
      repeat
        local ID, Msg = rednet.receive()
        if Msg == "Ho!" then
          Hos = Hos+1
        end
      until Hos == Position
    end
  end
end