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5984: Divisor Tree

内存限制：256 MB 时间限制：2 S
题面：传统 评测方式：文本比较 上传者：
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题目描述

E. Divisor Tree
time limit per test
0.5 seconds
memory limit per test
256 megabytes
input
standard input
output
standard output
A divisor tree is a rooted tree that meets the following conditions:
  • Each vertex of the tree contains a positive integer number.
  • The numbers written in the leaves of the tree are prime numbers.
  • For any inner vertex, the number within it is equal to the product of the numbers written in its children.
Manao has n distinct integers a1,a2,...,an. He tries to build a divisor tree which contains each of these numbers. That is, for each ai, there should be at least one vertex in the tree which contains ai. Manao loves compact style, but his trees are too large. Help Manao determine the minimum possible number of vertices in the divisor tree sought.
Input
The first line contains a single integer n (1≤n≤8). The second line contains n distinct space-separated integers ai (2≤ai≤1012).
Output
Print a single integer − the minimum number of vertices in the divisor tree that contains each of the numbers ai.
Examples
Input 
2
6 10
Output 
7
Input 
4
6 72 8 4
Output 
12
Input 
1
7
Output 
1
Note
Sample 1. The smallest divisor tree looks this way:
Sample 2. In this case you can build the following divisor tree:
Sample 3. Note that the tree can consist of a single vertex.

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