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How many working days in year 1987?

Here is the detail of the calculation:

Because 1987 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 11 public holidays that do not fall during a weekend and we obtain 250 working days in 1987.

Here is the list of these 11 public holidays:

1. New Year's Day : четверг, 1 январь, 1987
2. Seollal / Korean New Year Holiday : среда, 28 январь, 1987
3. Seollal / Korean New Year Holiday : четверг, 29 январь, 1987
4. Seollal / Korean New Year Holiday : пятница, 30 январь, 1987
5. Independence Movement Day : понедельник, 2 март, 1987
6. Children's Day : вторник, 5 май, 1987
7. Chuseok / Midautumn Festival : вторник, 6 октябрь, 1987
8. Chuseok / Midautumn Festival : среда, 7 октябрь, 1987
9. Chuseok / Midautumn Festival : четверг, 8 октябрь, 1987
10. Hangeul Day : пятница, 9 октябрь, 1987
11. Christmas Day : пятница, 25 декабрь, 1987

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

1. Independence Movement Day : воскресенье, 1 март, 1987
2. Memorial Day : суббота, 6 июнь, 1987
3. Liberation Day : суббота, 15 август, 1987
4. National Foundation Day : суббота, 3 октябрь, 1987