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How many working days in year 1960?
Here is the detail of the calculation:
Because 1960 is a leap year, it has 366 days.
Let's remove 53 saturdays and 52 sundays. It remains 261 days.
Now, let's remove 4 public holidays that do not fall during a weekend and we obtain 257 working days in 1960.
 Here is the list of these 4 public holidays: 
 
 1. New Year's Day : п'ятниця, 1 січень, 1960 
2. Commemoration of Atatürk, Youth and Sports Day : четвер, 19 травень, 1960 
3. Victory Day : вівторок, 30 серпень, 1960 
4. Republic Day Eve : п'ятниця, 28 жовтень, 1960 
And here are the 3 public holidays falling on a weekend:
1. National Sovereignty and Children's Day : субота, 23 квітень, 1960 
2. Labour and Solidarity Day : неділя, 1 травень, 1960 
3. Republic Day : субота, 29 жовтень, 1960