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How many working days in year 1955?

Here is the detail of the calculation:

Because 1955 is not a leap year, it has 365 days.

Let's remove 52 saturdays and 53 sundays. It remains 260 days.

Now, let's remove 5 public holidays that do not fall during a weekend and we obtain 255 working days in 1955.

Here is the list of these 5 public holidays:

1. Pesach : четверг, 7 апрель, 1955
2. Shvi'i shel Pesach : среда, 13 апрель, 1955
3. Yom Ha-Atzmaut : среда, 27 апрель, 1955
4. Rosh Hashanah : воскресенье, 18 сентябрь, 1955
5. Yom Kippur : понедельник, 26 сентябрь, 1955

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

1. Shavuot : пятница, 27 май, 1955
2. Rosh Hashanah : суббота, 17 сентябрь, 1955
3. Sukkot : суббота, 1 октябрь, 1955
4. Shemini Atzeret / Simchat Torah : суббота, 8 октябрь, 1955