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 Java (OpenJDK 11.0.6) (judge verdict: Accepted)

import java.util.*;

class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        // ----------入力受付-----------//
        int N = sc.nextInt();               // 人数
        int K = sc.nextInt();               // お菓子の種類

        // -------状態を記憶する配列定義---------//
        boolean[] tricked = new boolean[N]; // お菓子を持っていない人はtrue
        Arrays.fill(tricked, true);         // 全員の初期状態としてtrueを指定

        // -----Aの入力より状態を記憶-----------//
        for (int i=0;i<K;i++){              // お菓子一種類ごとに確かめる
            int d = sc.nextInt();           // お菓子を持っている人数
            for(int j=0;j<d;j++){
                int a = sc.nextInt();       // お菓子iを持っている人はフラグを下ろす
                tricked[a-1]=false;
            }
        }
        //----------数える--------//
        int cnt = 0;                        // カウント用変数
        for(int l=0; l<N;l++){
            if(tricked[l]){                  // お菓子を受け取っていない人をカウント
                cnt++;
            }
        }
        //-----------出力----------//
        System.out.println(cnt);
    }
}