use proconio::input;
use std::collections::HashSet;

fn main() {
    input! {
        _n: usize,
        x: usize,
        q: usize,
    }

    let mut ans = 0.;
    for _ in 0..q {
        input! {
            m: usize,
            f: [usize; m],
        }

        let f: HashSet<usize> = f.into_iter().collect();
        if f.contains(&x) {
            ans += 1.;
        } else if f.len() != m {
            ans += 0.5;
        }
    }
    println!("{}", ans);
}