New Operation Defined
测试数据来自 AOCode/1053
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P1053 New Operation Defined
Problem Statement
AO and AO's npy's math teacher, YYQ, defined a new operation.
- If \(x\) is a prime number, then \(f(x)=1\)
- If \(a\) and \(b\) are two integers that are greater than 1, then \(f(a \times b)= b \times f(a) +a \times f(b) \)
YYQ wrote a huge number, \(y\) on the blackboard. It's so huge that he had to write it as a product of many prime numbers. He wanted AO's npy to calculate \(f(y)\). Unfortunately, she wasn't able to do that. To save his npy, AO raised up his hand.
Input
The first line contains \(n\), the number of prime numbers.
The next line contains \(n\) integers, \(a_1, a_2, a_3, ......, a_n\) the prime numbers, whose product is \(y\)
Output
One integer, \(f(y)\).
Sample
Input 1
4
2 2 2 3
Output 1
44
For this case, \( f(2 \times 2 \times 2 \times 3) = f(24) = 4 \times f(6) + 6 \times f(4) = 4 \times (2 \times f(3) + 3 \times f(2)) + 6 \times (2 \times f(2) + 2 \times f(2)) = 4 \times 5 + 6 \times 4 = 20 + 24 = 44 \)
Constraints
- For every \( 1 \le i \le n\) , \( 2 \le a_i \le 10^3 \)
- \( 1 \le n \le 2000 \)
Source?
Times Maths Newspaper (bushi