#include <bits/stdc++.h>
using namespace std;
using ll = long long;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n, x, q;
    cin >> n >> x >> q;
    int ans = 0;
    while(q--){
        int m;
        cin >> m;
        vector<int> a(m);
        for(auto &&v : a) cin >> v;
        sort(a.begin(), a.end());
        if(binary_search(a.begin(), a.end(), x)){
            ans += 2;
        }else{
            for(int i = 0; i + 1 < m; i++){
                if(a[i] == a[i + 1]){
                    ans++;
                    break;
                }
            }
        }
    }
    cout << ans / 2;
    if(ans & 1){
        cout << ".5";
    }
    cout << '\n';
}