Given a set of ~N~ distinct positive integers, find the number of different repeating positive integers from a new set of ~M~ distinct positive integers compared to the set ~N~.

Input Specification

The first line will contain two space-separated integers ~N~ and ~M~ ~(1 \le N, M \le 10^4)~.

The second line will contain ~N~ space-separated integers ~a_1,a_2,...,a_n~ ~(1 \le a_i \le 10^5)~.

The third line will contain ~M~ space-separated integers ~a_1,a_2,...,a_m~ ~(1 \le a_i \le 10^5)~.

Output Specification

Print out one integer representing the number of repeating positive integers.

Sample Input

5 4
1 2 3 4 5
3 6 5 7

Sample Output

2

Explanation

The array ~M~ has two repeating numbers (~3~ and ~5~).