using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

class Program
{
    static void Main(string[] args)
    {
        int N = int.Parse(Console.ReadLine());
        int M1 = int.Parse(Console.ReadLine());
        var A = ReadInts();
        int M2 = int.Parse(Console.ReadLine());
        var B = ReadInts();

        var C = new int[N + 1].ToList();
        int p = 0;
        foreach(var a in A)
        {
            p += a;
            C[p] = 1;
        }
        foreach(var b in B)
        {
            p -= b;
            C[p] = 1;
        }

        Console.WriteLine(N+1-C.Sum());
    }

    static List<int> ReadInts()
    {
        var strs = new List<string>(Console.ReadLine().Split(' '));
        return strs.ConvertAll(x => int.Parse(x));
    }
}