Определить период

...

How many working days in year 1988?

Here is the detail of the calculation:

Because 1988 is a leap year, it has 366 days.

Let's remove 53 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 1988.

Here is the list of these 10 public holidays:

1. Solenidade da Santa Mãe de Deus : пятница, 1 январь, 1988
2. Sexta-Feira Santa : пятница, 1 апрель, 1988
3. Dia da Liberdade : понедельник, 25 апрель, 1988
4. Corpo de Deus : четверг, 2 июнь, 1988
5. Dia de Portugal : пятница, 10 июнь, 1988
6. Assunção de Nossa Senhora : понедельник, 15 август, 1988
7. Implantação da República : среда, 5 октябрь, 1988
8. Todos os Santos : вторник, 1 ноябрь, 1988
9. Restauração da Independência : четверг, 1 декабрь, 1988
10. Dia da Imaculada Conceição : четверг, 8 декабрь, 1988

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

1. Páscoa : воскресенье, 3 апрель, 1988
2. Dia do Trabalhador : воскресенье, 1 май, 1988
3. Natal : воскресенье, 25 декабрь, 1988