function mine()
    local success = false
    success = turtle.dig()
    success = turtle.digUp()
    success = turtle.digDown()
    if  turtle.getItemCount(16)>3 then
    feed()
    giveMeMoreFeed()
    end
    feed()
    return success
end

function feed()
    local fuel_level = turtle.getFuelLevel()
    if fuel_level<5000 then
    turtle.select(1)
    turtle.refuel()
    giveMeMoreFeed()
    end
end

function giveMeMoreFeed()
    if turtle.detectUp() then
        mine()
    end
    turtle.select(2)
    turtle.placeUp()
    turtle.select(1)
    turtle.suckUp()
    for i=3,16 do
        turtle.select(i)
        turtle.dropUp()
    end
    turtle.select(2)
    turtle.digUp()
end

local min_z = 5
local max_z = 45

local size = 50
local x = 0
local y = 0
local z = 72

print("x")
x =  tonumber( read() )

print("y")
y =  tonumber( read() )

print("z")
z =  tonumber( read() )
 local mmy_z = 0
turtle.refuel()
while true do
for my_z = z,max_z do
    turtle.turnLeft()
    for i=0,size do
        local success = mine()
        if success ~=true then
            turtle.turnRight()
            turtle.turnRight()
            for retI = 0,i do
            turtle.forward()
            feed()
            end
        end
    end

    turtle.turnRight()
    turtle.turnRight()
    for retI = 0,i do
    turtle.forward()
        feed()
    end
    turtle.mine()
    turtle.forward()
    turtle.mine()
    turtle.up()
mmy_z = my_z
end

for randomTemp = mmy_z,min_z do
    feed()
    turtle.down()
end
end