algorithm with a,b

["mina_world"]

Hello sir~

I showed algorithm.

a is non-negative integer.
b is positive integer.

start with a, b.

(*)
if a < b, output a. End

if a >= b, a = a-b.
returen to (*).

for given a, b,
what's output ??

hint) with definition of sequence.

----------------------------------
How do you think about it ?