求助，为什么会产生runtime error > ^ <

import java.util.Scanner;

public class Main{
    public static void main(String[] args){
        Scanner in = new Scanner(System.in);
        int[] m = new int[2000000];
        int[] n = new int[999];
        for (int i = 0; i < m.length; i++){
            m[i] = in.nextInt();
            n[m[i]] += 1;
        }
        for (int j = 0; j < n.length; j++){
            System.out.println(n[j]);
        }
    }
}