#nullable enable

#region
var _input = Array.Empty<string>();
var _iter = 0;
string String()
{
    while (_iter >= _input.Length) (_input, _iter) = (Console.ReadLine()!.Split(' '), 0);
    return _input[_iter++];
}
T I<T>() where T : IParsable<T> => T.Parse(String(), null);
#endregion
static T[] Range<T>(int n, Func<T> F) => Enumerable.Range(0, n).Select(_ => F()).ToArray();

var n = I<int>();
var x = I<int>();
var q = I<int>();
var ans = 0.0;
for (var i = 0; i < q; i++)
{
    var m = I<int>();
    var f = Range(m, I<int>);
    var s = new HashSet<int>(f);
    if (s.Contains(x)) ans += 1;
    else if (s.Count == m) ans += 0.5;
}
Console.WriteLine(ans);