Python run times

[theroflchopper]

I have to state running times using the big-O notation. I'm not sure how you do this

x = 0
a = 6
b = 6
c = 1
for i in range(2*n):
     x = x + c
     c = c + b
     b = b + a
print x

Could someone give me a hint on how I should approach this problem?

[kaarthikeyapreyan]

Is it that your are look for the performance metrics of the loop that you are running ? there are a lot of profiling tools that are available for getting the runtime states of the python program.