using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;
class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var n = NN;
        var m1 = NN;
        var a = NList;
        var m2 = NN;
        var b = NList;
        var d = new bool[n + 1];
        var pos = 0;
        for (var i = 0; i < a.Length; ++i)
        {
            d[pos + a[i]] = true;
            pos += a[i];
        }
        for (var i = 0; i < b.Length; ++i)
        {
            d[pos - b[i]] = true;
            pos -= b[i];
        }
        WriteLine(d.Count(f => !f));
    }
}