Prime Divisor

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Chef is very fond of maths. He is working with the numbers to find the number of numbers between 1 and N both inclusive which are divisible by any of the prime number less than 20, but he could do only for the small numbers mathematically. He is very much enthusiastic to find the result for the larger numbers, so you being Chef's friend and also a good programmer. Help him to get the result. I

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solution.cppC++17

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