A: Taking a Seat-Taking a Seat-

story

Mr. A entered the classroom at the examination site to take an examination. However, Mr. A is a very nervous type. Therefore, depending on the situation, there may be seats that Mr. A does not want to sit in. Therefore, Mr. A decided to find out how many seats he could sit on based on certain conditions.

problem

Mr. A is a nervous type of person. First of all, Mr. A cannot sit in the first row from the front. Because when I sit near the proctor, I get nervous and can't solve the problem. Also, if there is a person on the right or left, Mr. A cannot sit down. This is because the sound of the pencil next to me makes it impossible to concentrate during the test. In addition, you can't sit near a noisy guy (near 8 diagonally up, down, left, and right). This is because my voice echoes in my head during the break and I can't rest. Also, it's natural, but I can't sit in the seat where the students are already sitting.

Is there a place where Mr. A can sit under these conditions? Assuming that M x N seats are lined up in the classroom, let's find the number.

Input format

The first row gives M (number of rows: number of vertical seats) and N (number of columns: number of horizontal seats). From the second line, M lines and a character string of length N are given line by line. The j character of the i-th character string represents the state of the seat in the i-th row and the j-th column. Each letter is either'-',' x'or'o', vacant seats'-', noisy students sitting during breaks'x', other students sitting' Let it be o'.

Constraint

* 0 <M ≤ 100
* 0 <N ≤ 100



Output format

Output the number of seats that Mr. A can sit in one line depending on the conditions. Don't forget the line break at the end.

Input example 1


5 5
--o--
--xo-
--x--
o --- x
--xoo


Output example 1


3

Input example 2


2 6
--oooo
x--o--


Output example 2


1

Input example 3


3 5
-----
-----
-----


Output example 3


Ten

Input example 4


4 6
o-oxoo
oo-ooo
oooxo-
o-ooox


Output example 4


0





Example

Input

5 5
--o--
--xo-
--x--
o---x
--xoo


Output

3
#include <iostream>
#include <vector>

bool in_field(int x, int y, int W, int H)
{
    return 0 <= x && x < W && 0 <= y && y < H;
}

int main()
{
    int H, W;
    std::cin >> H >> W;

    std::vector<std::string> s(H);
    for (int i = 0; i < H; i++) {
        std::cin >> s[i];
    }
    
    int seat_cnt = 0;
    for (int i = 1; i < H; i++) {        
        for (int j = 0; j < W; j++) {
            bool ok = (s[i][j] == '-');
            for (int dj : {-1, 1}) {
                int nj = j + dj;
                if (in_field(nj, i, W, H) && s[i][nj] != '-') {
                    ok = 0;
                }
            }
            constexpr int di[] = {-1, -1, -1, +0, +0, +1, +1, +1};
            constexpr int dj[] = {-1, +0, +1, +0, +0, -1, +0, +1};
            for (int k = 0; k < 8; k++) {
                int ni = i + di[k];
                int nj = j + dj[k];
                if (in_field(nj, ni, W, H) && s[ni][nj] == 'x') {
                    ok = 0;
                }
            }

            seat_cnt += ok;
        }
    }

    std::cout << seat_cnt << std::endl;
    return 0;
}