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How many working days in year 1957?

Here is the detail of the calculation:

Because 1957 is not a leap year, it has 365 days.

Let's remove 52 saturdays and 52 sundays. It remains 261 days.

Now, let's remove 8 public holidays that do not fall during a weekend and we obtain 253 working days in 1957.

Here is the list of these 8 public holidays:

1. New Year's Day : вторник, 1 январь, 1957
2. Good Friday : пятница, 19 апрель, 1957
3. Easter Monday : понедельник, 22 апрель, 1957
4. Labour Day : среда, 1 май, 1957
5. Establishment Day : понедельник, 1 июль, 1957
6. National Day : вторник, 1 октябрь, 1957
7. Christmas Day : среда, 25 декабрь, 1957
8. Boxing Day : четверг, 26 декабрь, 1957

And here is the public holiday falling on a weekend:

1. Holy Saturday : суббота, 20 апрель, 1957