Gravel

local x = 1

function stack()
   for i = 1, 5 do
      turtle.up()
      turtle.placeDown()
   end
end

function topple()
   for i = 1, 5 do
      turtle.digDown()
      turtle.down()
   end
end

term.write("Cycles = ")
x = tonumber(read())

for i = 1, x do
   stack()
   topple()
end