function a()
 turtle.up()
 turtle.turnLeft()
 turtle.turnLeft()
 turtle.forward()
 turtle.forward()
 turtle.turnLeft()
 turtle.drop()
 turtle.select(1)
 turtle.suck()
 turtle.turnLeft()
 turtle.forward()
 turtle.forward()
 turtle.down()
end

function b()
 turtle.up()
 turtle.turnLeft()
 turtle.turnLeft()
 turtle.forward()
 turtle.forward()
 turtle.select(2)
 turtle.suck()
 turtle.turnLeft()
 turtle.turnLeft()
 turtle.forward()
 turtle.forward()
 turtle.down()
end

function c()
 turtle.up()
 turtle.turnLeft()
 turtle.turnLeft()
 turtle.forward()
 turtle.forward()
 turtle.turnRight()
 turtle.suck()
 turtle.select(3)
 turtle.refuel(64)
 turtle.turnRight()
 turtle.forward()
 turtle.forward()
 turtle.down()
end

function d()
 turtle.digUp()
 turtle.up()
end

function e()
 turtle.select(1)
 turtle.place()
 turtle.select(2)
 turtle.place()
 turtle.place()
 turtle.place()
 turtle.place()
 turtle.place()
 turtle.place()
 turtle.place()
 turtle.place()
 turtle.place()
 turtle.place()
 turtle.place()
 turtle.place()
end

if turtle.getItemCount(1) < 1 then
a()
end

if turtle.getItemCount(2) < 1 then
b()
end

if turtle.getFuelLevel() < 100 then
c()
end

e()
turtle.dig()
turtle.forward()
d()
d()
d()
d()
d()
turtle.down()
turtle.down()
turtle.down()
turtle.down()
turtle.down()
turtle.down()
turtle.down()
turtle.down()
turtle.down()
turtle.down()
turtle.down()
turtle.down()
turtle.down()
turtle.turnLeft()
turtle.select(3)
turtle.drop()
turtle.turnRight()
turtle.turnRight()
turtle.forward()
turtle.turnLeft()
turtle.turnLeft()

sleep(300)