In mathematical statistics there is such a thing as the median of a series of numbers. The median of a series of numbers is a number in the middle of an ascending series of numbers if the number of figures is odd. If the number of figures in the row is even, then the median of the row is the half-sum of the two numbers in the middle of the ascending order.

But in Yaroslavl State University they are not lazy — scholars have invented a new concept — the median of Professor R. Let's define it. The median of Professor R. of a series of numbers is the number in this series closest to the half-sum of the minimum and maximum figures, and if there are several such numbers, the minimum in value is selected from them. Your task is to find Professor R's median in a given series of numbers.