import java.io.*;
import java.util.*;

public class Solution {

    class Pair {
        int a;
        int b;

        public Pair(int a, int b) {
            this.a = a;
            this.b = b;
        }
    }

    void solve() {
        int n = in.nextInt();
        int m = in.nextInt();
        char[][] map = in.nextCharMap(n, m);
        int ans = 0;
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < m; j++) {
                if (map[i][j] == 'x') {
                    ans++;
                    bfs(i, j, map, n, m);
                }
            }
        }
        out.println(ans);

    }

    void bfs(int i, int j, char[][] map, int n, int m) {
        ArrayDeque<Pair> queue = new ArrayDeque<>();
        queue.add(new Pair(i, j));
        while (!queue.isEmpty()) {
            Pair cur = queue.poll();
            map[cur.a][cur.b] = 'o';
            if (cur.a - 1 >= 0 && map[cur.a - 1][cur.b] == 'x') {
                queue.add(new Pair(cur.a - 1, cur.b));
            }
            if (cur.a + 1 < n && map[cur.a + 1][cur.b] == 'x') {
                queue.add(new Pair(cur.a + 1, cur.b));
            }
            if (cur.b - 1 >= 0 && map[cur.a][cur.b - 1] == 'x') {
                queue.add(new Pair(cur.a, cur.b - 1));
            }
            if (cur.b + 1 < m && map[cur.a][cur.b + 1] == 'x') {
                queue.add(new Pair(cur.a, cur.b + 1));
            }
        }
    }


    Scanner in;
    PrintWriter out;

    void run() {
        try {
            in = new Scanner(new File("A.in"));
            out = new PrintWriter(new File("A.out"));

            solve();

            out.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }

    void runIO() {

        in = new Scanner(System.in);
        out = new PrintWriter(System.out);

        solve();

        out.close();
    }

    class Scanner {
        BufferedReader br;
        StringTokenizer st;

        public Scanner(File f) {
            try {
                br = new BufferedReader(new FileReader(f));
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
        }

        public Scanner(InputStream f) {
            br = new BufferedReader(new InputStreamReader(f));
        }

        String next() {
            while (st == null || !st.hasMoreTokens()) {
                String s = null;
                try {
                    s = br.readLine();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                if (s == null)
                    return null;
                st = new StringTokenizer(s);
            }
            return st.nextToken();
        }

        private boolean isSpaceChar(int c) {
            return !(c >= 33 && c <= 126);
        }

        private int skip() {
            int b;
            while ((b = read()) != -1 && isSpaceChar(b)) ;
            return b;
        }

        private int read() {
            int res = -1;
            try {
                res = br.read();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return res;
        }

        char[] nextCharArray(int size) {
            char[] buf = new char[size];
            int b = skip(), p = 0;
            while (p < size && !(isSpaceChar(b))) {
                buf[p++] = (char) b;
                b = read();
            }
            return size == p ? buf : Arrays.copyOf(buf, p);
        }

        char[][] nextCharMap(int n, int m) {
            char[][] map = new char[n][];
            for (int i = 0; i < n; i++) {
                map[i] = nextCharArray(m);
            }
            return map;
        }

        boolean hasMoreTokens() {
            while (st == null || !st.hasMoreTokens()) {
                String s = null;
                try {
                    s = br.readLine();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                if (s == null)
                    return false;
                st = new StringTokenizer(s);
            }
            return true;
        }

        int nextInt() {
            return Integer.parseInt(next());
        }

        long nextLong() {
            return Long.parseLong(next());
        }

        double nextDouble() {
            return Double.parseDouble(next());
        }
    }

    public static void main(String[] args) {
        new Solution().runIO();
    }
}