<HTML><HEAD></HEAD>
<BODY dir=ltr>
<DIV dir=ltr>
<DIV style="FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE: 12pt">
<DIV>def factorial(n):</DIV>
<DIV> if n<2:</DIV>
<DIV>
return 1</DIV>
<DIV> f = 1</DIV>
<DIV> while n>= 2:</DIV>
<DIV> f *= n</DIV>
<DIV> f -= 1</DIV>
<DIV> return f</DIV>
<DIV> </DIV></DIV></DIV></BODY></HTML>