#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, s, e) for (int i = (int)s; i < (int)e; i++)

int main() {
    cin.tie(nullptr);
    
    int N;
    cin >> N;
    
    vector<bool> clean(N + 1, true);
    clean[0] = false;
    
    int ans = N;
    
    int M1;
    cin >> M1;
    int now = 0;
    rep(i, 0, M1) {
        int A;
        cin >> A;
        
        now += A;
        clean[now] = false;
        ans--;
    }
    
    int M2;
    cin >> M2;
    rep(i, 0, M2) {
        int A;
        cin >> A;
        
        now -= A;
        if (clean[now]) ans--;
    }
    
    cout << ans << '\n';
}