CF75C Modified GCD

Well, here is another math class task. In mathematics, GCD is the greatest common divisor, and it's an easy task to calculate the GCD between two positive integers. A common divisor for two positive numbers is a number which both numbers are divisible by. But your teacher wants to give you a harder task, in this task you have to find the greatest common divisor $ d $ between two integers $ a $ and $ b $ that is in a given range from $ low $ to $ high $ (inclusive), i.e. $ low

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