S

print("Please not that when all required fields are filled, I will begin mining straight ahead, then progress right")

print("enter shaft length")
L = tonumber(read())
print("enter number of shafts")
N = tonumber(read())
print("enter shaft spacing, a shaft spacing of 3 will ensure 100% wall coverage")
S = tonumber(read())
turtle.refuel()
LL = 0
SS = 0
NN = 0
R = 0
while NN < N do
Q = 0
R = 0
while LL < L do
turtle.dig()
turtle.forward()
turtle.digUp()
LL = LL + 1
R = 1
print("moving forward")
end

if LL == L then
if R == 1 then
turtle.turnLeft()
turtle.turnLeft()
print("Turning left at the end of run")

R = 0
end
end


while LL > 0 do
turtle.forward()
print("moving forward after turning around")
LL = LL - 1
Q = 1
end


if LL == 0 then
if Q == 1 then
turtle.turnLeft()
Q = 0
print("turning left to start new shaft")
end
end


while SS < S do
turtle.dig()
turtle.forward()
turtle.digUp()
SS = SS + 1
print("setting spacing")
if SS == S then
turtle.turnLeft()
X = 1
end
end


if SS > 0 then
if X == 1 then
SS = 0
X = 0
end
print("reseting spacing counter")
end


NN = NN + 1
print("counting one shaft")
end