#pragma GCC optimize("Ofast")
#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef unsigned long long int ull;

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
ll myRand(ll B) {
    return (ull)rng() % B;
}
inline double time() {
    return static_cast<long double>(chrono::duration_cast<chrono::nanoseconds>(chrono::steady_clock::now().time_since_epoch()).count()) * 1e-9;
}

int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    int n; cin >> n;
    vector<int> f(n+1, 1);
    int cur = 0;
    int m; cin >> m;
    for (int i = 0; i < m; ++i) {
        int a; cin >> a;
        cur += a;
        f[cur] = 0;
    }
    cin >> m;
    for (int i = 0; i < m; ++i) {
        int a; cin >> a;
        cur -= a;
        f[cur] = 0;
    }
    int res = 0;
    for (int i = 0; i < n; ++i) {
        res += f[i];
    }
    cout << res << endl;
}