Untitled

#!/usr/bin/python
print "Content-type: text/html"
print
print "<html><head>"
print ""
print "</head><body>"

import cgi
form = cgi.FieldStorage()
result = 0
numberN = form["numberN"].value
if isinstance(numberN, int) and numberN > 0
    for x in range(0, numberN)
        result += x

print result

print "</body></html>"