I am an international student in Canada with a valid student visa. I planned to make a visit to Switzerland for a week to visit my sister residing there on my way to my home country . My question is about the proof of financial resources.

As I am a student CAD 30 is needed per day and I am going to stay in Switzerland for 7 days. So I have to show a balance of CAD 30*7 = CAD 210.

Do I have this amount in my bank statement for the
whole 3 months
or
balance at end of each bank statement having CAD 210 (e.g., Feb balance CAD 300, Mar balance CAD 400, Apr balance CAD 350), is enough?

Thanks in advance,
Kj