func lagarias n .
if n < 0 : return -lagarias -n
if n = 0 or n = 1 : return 0
f = 2
while n mod f <> 0
f += 1
.
q = n / f
if q = 1 : return 1
return q * lagarias f + f * lagarias q
for n = -99 to 100
write lagarias n & " "