#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

#define MAXMONEY 300

int H, W;
vector<vector<int>> cells;

int check()
{
    char cell;
    cin >> cell;
    if (cell == 'o')
        return 1;
    else if (cell == 'x')
        return -1;
    else
        return 0;
}

int walk(int i, int j, int sum)
{
    int cnt = 0;
    if (cells[i][j] == 0) // 通行止め
        return cnt;
    else // 通行可能
        sum += cells[i][j];
    if (sum < 0)
        return cnt;
    // cout << i << ' ' << j << ' ' << sum << endl;

    if (i == H - 1 && j == W - 1) // goal
        return 1 ? sum > 0 : 0;

    if (i < H - 1)
        cnt += walk(i + 1, j, sum); // down
    if (j < W - 1)
        cnt += walk(i, j + 1, sum); // right

    return cnt;
}

int main()
{
    cin >> H >> W;
    cells = vector<vector<int>>(H, vector<int>(W));
    for (int i = 0; i < H; ++i)
    {
        for (int j = 0; j < W; ++j)
        {
            cells[i][j] = check();
            // cout << cells[i][j] << ' ';
        }
        // cout << endl;
    }

    int cnt = walk(0, 0, 0);
    // cout << H << W << endl;
    cout << cnt << endl;
}