#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using P = pair<ll, ll>;
#define rep(i, a, b) for(ll i = a; i < b; ++i)
#define rrep(i, a, b) for(ll i = a; i >= b; --i)
constexpr ll inf = 4e18;
struct SetupIO {
    SetupIO() {
        ios::sync_with_stdio(0);
        cin.tie(0);
        cout << fixed << setprecision(30);
    }
} setup_io;
int main(void) {
    int n;
    cin >> n;
    vector<bool> flag(n + 1);
    int m1;
    cin >> m1;
    vector<int> a(m1);
    int cur = 0;
    flag[cur] = true;
    rep(i, 0, m1) {
        cin >> a[i];
        cur += a[i];
        flag[cur] = true;
    }
    assert(cur == n);
    int m2;
    cin >> m2;
    vector<int> b(m2);
    rep(i, 0, m2) {
        cin >> b[i];
        cur -= b[i];
        flag[cur] = true;
    }
    assert(cur == 0);
    int ans = 0;
    rep(i, 0, n + 1) {
        if(!flag[i]) ans++;
    }
    cout << ans << '\n';
}