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How many working days in year 2121?

Here is the detail of the calculation:

Because 2121 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 8 public holidays that do not fall during a weekend and we obtain 253 working days in 2121.

Here is the list of these 8 public holidays:

1. New Year's Day : среда, 1 январь, 2121
2. Independence Movement Day : понедельник, 3 март, 2121
3. Children's Day : понедельник, 5 май, 2121
4. Memorial Day : пятница, 6 июнь, 2121
5. Liberation Day : пятница, 15 август, 2121
6. National Foundation Day : пятница, 3 октябрь, 2121
7. Hangeul Day : четверг, 9 октябрь, 2121
8. Christmas Day : четверг, 25 декабрь, 2121

And here is the public holiday falling on a weekend:

1. Independence Movement Day : суббота, 1 март, 2121