#nullable enable

#region
var (_input, _iter) = (Array.Empty<string>(), 0);
T I<T>() where T : IParsable<T>
{
    while (_iter >= _input.Length) (_input, _iter) = (Console.ReadLine()!.Trim().Split(' '), 0);
    return T.Parse(_input[_iter++], null);
}
#endregion

var n = I<int>();
var m = I<int>();
var tz = new bool[n, m];
var cz = new int[n];
for (var i = 0; i < n; i++)
{
    var s = I<string>();
    for (var j = 0; j < m; j++) if (s[j] == 'o')
    {
        tz[i, j] = true;
        cz[j]++;
    }
}
var ans = 0;
for (var i = 0; i < n; i++)
{
    var d = 0;
    for (var j = 0; j < m; j++) if (tz[i, j]) d = 1;
    for (var j = 0; j < m; j++) if (tz[i, j] && cz[j] > 1) d = 0;
    ans += d;
}
Console.WriteLine(ans);