Problem:
Score : 200 points

Problem Statement

N Snukes called Snuke 1, Snuke 2, ..., Snuke N live in a town.

There are K kinds of snacks sold in this town, called Snack 1, Snack 2, ..., Snack K. The following d_i Snukes have Snack i: Snuke A_{i, 1}, A_{i, 2}, \cdots, A_{i, {d_i}}.

Takahashi will walk around this town and make mischief on the Snukes who have no snacks. How many Snukes will fall victim to Takahashi's mischief?

Constraints

All values in input are integers.

1 \leq N \leq 100

1 \leq K \leq 100

1 \leq d_i \leq N

1 \leq A_{i, 1} < \cdots < A_{i, d_i} \leq N

Input

Input is given from Standard Input in the following format:

N K
d_1
A_{1, 1} \cdots A_{1, d_1}
\vdots
d_K
A_{K, 1} \cdots A_{K, d_K}

Output

Print the answer.

Sample Input 1

3 2
2
1 3
1
3

Sample Output 1

1

Snuke 1 has Snack 1.

Snuke 2 has no snacks.

Snuke 3 has Snack 1 and 2.

Thus, there will be one victim: Snuke 2.

Sample Input 2

3 3
1
3
1
3
1
3

Sample Output 2

2

Solution in Rust (1.42.0) (judge verdict: Accepted)

use std::io;
use std::str::FromStr;
use std::iter::Map;
use std::str::SplitWhitespace;

fn split_to_i64<'r>(buf: &'r String) -> Map<SplitWhitespace, impl FnMut(&'r str) -> i64> {
    let mp = buf
        .split_whitespace()
        .map(|n| i64::from_str(n).unwrap())
        .into_iter();

    return mp;
}

fn get_int() -> i64 {
    let stdin = io::stdin();
    let mut buf = String::new();
    stdin.read_line(&mut buf);
    buf.pop();
    return i64::from_str(&buf).unwrap();
}

fn get_int_itr<'r>(buf: &'r mut String) -> Map<SplitWhitespace, impl FnMut(&'r str) -> i64> {
    let stdin = io::stdin();
    stdin.read_line(buf);
    return split_to_i64(buf);
}

fn main() {
    let stdin = io::stdin();
    let mut buf = String::new();
    stdin.read_line(&mut buf);
    buf.pop();
    let mut it = split_to_i64(&buf);
    let N = it.next().unwrap();
    let K = it.next().unwrap();
    let mut friends: Vec<i32> = Vec::with_capacity(101);
    for i in 0..101 {
        friends.push(0);
    }
    for i in 0..K {
        let mut buf1 = String::new();
        let d = get_int();
        let mut it = get_int_itr(&mut buf1);
        for j in 0..d {
            let id = it.next().unwrap();
            // println!("{}", id);
            friends[id as usize] += 1;
        }
    }
    let mut res = 0;
    for i in 1..(N+1) {
        if friends[i as usize] == 0 {
            res += 1;
        }
    }
    println!("{}", res);
}