this should work

bethigh = false
good    = balance*10
prebet  = 0
nextbet = prebet
box     = 0
min     = 49.95
cox     = 49
chance  = cox
function dobet()
if win then
    chance  = cox
    nextbet = prebet
    bethigh = false
end
if (chance==min) and !win then
    nextbet = previousbet*2.5
end
if  lastBet.Roll < min then
    box+=1
end
if lastBet.Roll > min then
    box = 0
end
if (chance == cox) and box >= 10 then
   chance  = min
   nextbet = balance/3900
   box     = 0
end
if balance > good then
    stop()
end
end