#include <bits/stdc++.h>
using namespace std;
using ll = long long;

int main()
{
    int N;
    cin >> N;
    set<int> s;
    int x = 0;
    int M1;
    cin >> M1;
    for (int i = 0; i < M1; i++)
    {
        int A;
        cin >> A;
        x += A;
        s.insert(x);
    }
    int M2;
    cin >> M2;
    for (int i = 0; i < M2; i++)
    {
        int B;
        cin >> B;
        x -= B;
        s.insert(x);
    }

    cout << N + 1 - s.size() << endl;
}