Определить период

...

How many working days in year 1997?

Here is the detail of the calculation:

Because 1997 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 10 public holidays that do not fall during a weekend and we obtain 251 working days in 1997.

Here is the list of these 10 public holidays:

1. Solenidade da Santa Mãe de Deus : среда, 1 январь, 1997
2. Sexta-Feira Santa : пятница, 28 март, 1997
3. Dia da Liberdade : пятница, 25 апрель, 1997
4. Dia do Trabalhador : четверг, 1 май, 1997
5. Corpo de Deus : четверг, 29 май, 1997
6. Dia de Portugal : вторник, 10 июнь, 1997
7. Assunção de Nossa Senhora : пятница, 15 август, 1997
8. Restauração da Independência : понедельник, 1 декабрь, 1997
9. Dia da Imaculada Conceição : понедельник, 8 декабрь, 1997
10. Natal : четверг, 25 декабрь, 1997

And here are the 3 public holidays falling on a weekend:

1. Páscoa : воскресенье, 30 март, 1997
2. Implantação da República : воскресенье, 5 октябрь, 1997
3. Todos os Santos : суббота, 1 ноябрь, 1997