Sonya Clears the Array
Pussycat Sonya has an array A consisting of N integers (N is even). She can perform operations of two types:
She wants to delete all elements from array A. What is the minimum number of operations that she needs to perform?
The first line of the input contains one even integer N, the number of elements in array A (0 ≤ N ≤ 500). The second line contains N space-separated positive integers, the elements of array A (1 ≤ Ai ≤ 106).
Print the minimum number of operations that Sonya needs to perform.
A prime number is an integer greater than 1 that has no positive divisors other than 1 and itself.
Output for Sample Input
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