Day 256

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Rick invented a [Time Machine](https://en.wikipedia.org/wiki/Time_travel) and wants to test it by time-travelling to Russia on the $256th$ day of the year during the years in the inclusive range of $1700$ to $2700$. Till $1917$, Russia's official calendar was the [Julian Calendar](https://en.wikipedia.org/wiki/Julian_calendar); since $1919$, they used the [Gregorian calendar](https://en.wikiped

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solution.cppC++17

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