multiply large arrays with 2 threads

import java.util.Scanner;
public class Main {

    public static void main(String[] args) {
        int N = 5000;
        int[] list1 = new int[N];
        int[] list2 = new int[N];
        int total;

        Scanner scan = new Scanner(System.in);
        for (int k = 0; k <= N-1; k++)  list1[k] = scan.nextInt();
        for (int k = 0; k <= N-1; k++)  list2[k] = scan.nextInt();

        MyRunnable runnable1 = new MyRunnable(list1);
        Thread thread1 = new Thread(runnable1);

        MyRunnable runnable2 = new MyRunnable(list2);
        Thread thread2 = new Thread(runnable2);

        thread1.start();
        thread2.start();

        total = runnable1.getTotal() * runnable2.getTotal();

        System.out.println("total is : " + total);
    }
}
//*****************************
//"MyRunnable" file

public class MyRunnable implements Runnable{
    private int[] list;
    private int total = 1;

    public MyRunnable(int[] list){
        super();
        this.list = list;
    }
    public int getTotal(){
        return this.total;
    }
    @Override
    public void run() {
        for (int i : this.list) {
            this.total *= i;
        }
    }
}