#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using P = pair<ll,ll>;
#define fix(x) fixed << setprecision(x)
#define asc(x) x, vector<x>, greater<x>
#define rep(i, n) for(ll i = 0; i < n; i++)
#define all(x) (x).begin(),(x).end()
template<class T>bool chmin(T&a, const T&b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool chmax(T&a, const T&b){if(a<b){a=b;return 1;}return 0;}
constexpr ll INFLL = (1LL << 62), MOD = 998244353;
constexpr int INF = (1 << 30);

int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    int n;
    cin >> n;
    vector<bool> ok(n+1,true);
    ok[0] = ok[n] = false;
    int ans = n-1, now = 0;
    int x;
    cin >> x;
    while(x--){
        int k;
        cin >> k;
        now += k;
        ans -= ok[now];
        ok[now] = false;
    }
    cin >> x;
    while(x--){
        int k;
        cin >> k;
        now -= k;
        ans -= ok[now];
        ok[now] = false;
    }
    cout << ans << '\n';
    return 0;
}