#include <bits/stdc++.h>

using namespace std;
void fast_io() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
}

int main() {
    fast_io();
    int n;
    cin >> n;
    vector<bool> flg(n + 1);
    int cur = 0;
    flg[0] = true;
    int m1;
    cin >> m1;
    for (int i = 0; i < m1; i++) {
        int a;
        cin >> a;
        cur += a;
        flg[cur] = true;
    }
    int m2;
    cin >> m2;
    for (int i = 0; i < m2; i++) {
        int b;
        cin >> b;
        cur -= b;
        flg[cur] = true;
    }
    int ans = 0;
    for (int i = 0; i <= n; i++) {
        ans += !flg[i];
    }
    cout << ans << endl;
}