俄罗斯方块

import java.util.*;
public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int m = sc.nextInt();
        int[] v = new int[n + 1];
        for(int i = 0; i < m; ++i) v[sc.nextInt()]++;
        Arrays.sort(v);//木桶效应，最低的木板就是得分
        System.out.println(v[1]);
    }
}