#include <bits/stdc++.h>
#include <atcoder/all>

using namespace std;
using namespace atcoder;

using ll = long long;

int main() {
    ll H, W;
    cin >> H >> W;

    vector<string> A(H);
    for (ll i = 0; i < H; i++) {
        cin >> A[i];
    }

    vector<vector<vector<ll>>> dp(H, vector<vector<ll>>(W, vector<ll>(30, 0)));

    dp[0][0][1] = 1;

    for (ll i = 0; i < H; i++) {
        for (ll j = 0; j < W; j++) {
            ll d;
            if (A[i][j] == '#') {
                continue;
            } else if (A[i][j] == 'x') {
                d = -1;
            } else {
                d = 1;
            }
            for (ll k = 0; k < 30; k++) {
                ll nk = k - d;
                if (nk < 0 || nk >= 30) {
                    continue;
                }
                if (i > 0) {
                    dp[i][j][k] += dp[i - 1][j][nk];
                }
                if (j > 0) {
                    dp[i][j][k] += dp[i][j - 1][nk];
                }
            }
        }
    }

    ll ans = 0;
    for (ll k = 0; k < 30; k++) {
        ans += dp[H - 1][W - 1][k];
    }

    cout << ans << endl;

    return 0;
}