Определить период

...

How many working days in year 1968?

Here is the detail of the calculation:

Because 1968 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 1968.

Here is the list of these 9 public holidays:

1. Solenidade da Santa Mãe de Deus : понедельник, 1 январь, 1968
2. Sexta-Feira Santa : пятница, 12 апрель, 1968
3. Dia da Liberdade : четверг, 25 апрель, 1968
4. Dia do Trabalhador : среда, 1 май, 1968
5. Dia de Portugal : понедельник, 10 июнь, 1968
6. Corpo de Deus : четверг, 13 июнь, 1968
7. Assunção de Nossa Senhora : четверг, 15 август, 1968
8. Todos os Santos : пятница, 1 ноябрь, 1968
9. Natal : среда, 25 декабрь, 1968

And here are the 4 public holidays falling on a weekend:

1. Páscoa : воскресенье, 14 апрель, 1968
2. Implantação da República : суббота, 5 октябрь, 1968
3. Restauração da Independência : воскресенье, 1 декабрь, 1968
4. Dia da Imaculada Conceição : воскресенье, 8 декабрь, 1968