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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 10 public holidays that do not fall during a weekend and we obtain 252 working days in 1964.

Here is the list of these 10 public holidays:

1. Confraternização Universal : среда, 1 январь, 1964
2. Terça-feira de Carnaval : вторник, 11 февраль, 1964
3. Sexta Feira Santa ou Paixão de Cristo : пятница, 27 март, 1964
4. Tiradentes : вторник, 21 апрель, 1964
5. Dia do Trabalho : пятница, 1 май, 1964
6. Corpus Christi : четверг, 28 май, 1964
7. Independência do Brasil : понедельник, 7 сентябрь, 1964
8. Nossa Senhora Aparecida : понедельник, 12 октябрь, 1964
9. Finados : понедельник, 2 ноябрь, 1964
10. Natal : пятница, 25 декабрь, 1964

And here are the 2 public holidays falling on a weekend:

1. Proclamação da República Brasileira : воскресенье, 15 ноябрь, 1964
2. Emancipação do Paraná : суббота, 19 декабрь, 1964