How many working days in year 1956?
Here is the detail of the calculation:
Because 1956 is a leap year, it has 366 days.
Let's remove 52 saturdays and 53 sundays. It remains 261 days.
Now, let's remove 7 public holidays that do not fall during a weekend and we obtain 254 working days in 1956.
 Here is the list of these 7 public holidays: 
 
 1. New Year's Holiday : понедельник, 2 январь, 1956 
2. National Day : среда, 15 февраль, 1956 
3. National Day Holiday : четверг, 16 февраль, 1956 
4. May Day : вторник, 1 май, 1956 
5. May Day Holiday : среда, 2 май, 1956 
6. Great Friday : пятница, 4 май, 1956 
7. Easter Monday : понедельник, 7 май, 1956 
And here are the 5 public holidays falling on a weekend:
1. New Year's Day : воскресенье, 1 январь, 1956 
2. Orthodox Christmas Day : суббота, 7 январь, 1956 
3. Orthodox Easter Saturday : суббота, 5 май, 1956 
4. Easter : воскресенье, 6 май, 1956 
5. Armistice Day : воскресенье, 11 ноябрь, 1956