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5903: Levko and Sets

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

D. Levko and Sets
time limit per test
3 seconds
memory limit per test
256 megabytes
input
standard input
output
standard output
Levko loves all sorts of sets very much.
Levko has two arrays of integers a1,a2,... ,an and b1,b2,... ,bm and a prime number p. Today he generates n sets. Let's describe the generation process for the i-th set:
  1. First it has a single number 1.
  2. Let's take any element c from this set. For all j (1≤j≤m) if number (c·aibj)modp doesn't occur in the set, then add it to the set.
  3. Repeat step 2 as long as we can add at least one element to our set.
Levko wonders, how many numbers belong to at least one set. That is, he wants to know what size is the union of n generated sets.
Input
The first line contains three integers n, m and p (1≤n≤104, 1≤m≤105, 2≤p≤109), p is prime.
The second line contains space-separated integers a1,a2,... ,an (1≤ai<p). The third line contains space-separated integers b1,b2,... ,bm (1≤bi≤109).
Output
The single number − the size of the union of the sets.
Examples
Input 
1 1 7
2
5
Output 
3
Input 
1 2 7
2
2 4
Output 
3
Input 
2 1 7
1 6
2
Output 
1
Input 
2 1 7
1 6
5
Output 
2

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