args = {...}
function forward()
n = 0
while (not turtle.forward()) do
n= n+1
turtle.dig()
turtle.attack()
if n==100 then print("can't move")
os.exit()
end
end
end
fuel  = turtle.getFuelLevel()
turtle.select(1)
for i=1,args[1] do
 for j=1,args[2] do
  turtle.placeDown()
  turtle.refuel()
  forward()
 end
 if i%2 ~= 0 then
 turtle.turnLeft()
 forward()
 turtle.turnLeft()
 else
 turtle.turnRight()
 forward()
 turtle.turnRight()
 end
end
if args[1]%2 ~= 0 then
 for i=1, args[1] do
  forward()
 end
turtle.turnLeft()
 for i=1,args[2] do
  forward()
 end
else
turtle.turnLeft()
 for i=1,args[2] do
  forward()
 end
turtle.turnLeft()
end
print(turtle.getFuelLevel()-fuel)