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How many working days in year 1964?
Here is the detail of the calculation:
Because 1964 is a leap year, it has 366 days.
Let's remove 52 saturdays and 52 sundays. It remains 262 days.
Now, let's remove 9 public holidays that do not fall during a weekend and we obtain 253 working days in 1964.
 Here is the list of these 9 public holidays: 
 
 1. Uusaasta : Wednesday, 1 January, 1964 
2. Iseseisvuspäev : Monday, 24 February, 1964 
3. Suur Reede : Friday, 27 March, 1964 
4. Kevadpüha : Friday, 1 May, 1964 
5. Võidupüha : Tuesday, 23 June, 1964 
6. Jaanipäev : Wednesday, 24 June, 1964 
7. Taasiseseisvumispäev : Thursday, 20 August, 1964 
8. Jõululaupäev : Thursday, 24 December, 1964 
9. Esimene jõulupüha : Friday, 25 December, 1964 
And here are the 3 public holidays falling on a weekend:
1. Ülestõusmispühad : Sunday, 29 March, 1964 
2. Nelipühad : Sunday, 17 May, 1964 
3. Teine jõulupüha : Saturday, 26 December, 1964