Read the following passage and solve the questions based on it.
Guru Nanak Institute of Management will organize six once-a-month lecture series for young entrepreneurs as per the following schedule, with no dates conflicting for any two different programmes:
(i) Marketing – August through January
(ii) Entrepreneurship – April through October
(iii) Law – January through September
(iv) Finance – March through June
(v) Accounts – October through April
(vi) HR – October through December
How many months of the year must a student attend to hear all the lectures on Marketing, Entrepreneurship and Finance?