#include<iostream>
#include<algorithm>
#include<stack>
#include<vector>
#include<set>

using namespace std;
using ll = long long;

int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    
    int n;
    cin>>n;
    int ans = 1+n;
    int now = 0;
    set<int> s;
    int a;
    cin>>a;
    for(int i = 0;i<a;i++){
        int k;
        cin>>k;
        now += k;
        s.insert(now);
    }
    cin>>a;
    for(int i = 0;i<a;i++){
        int k;
        cin>>k;
        now -= k;
        s.insert(now);
    }
    ans -= s.size();
    cout<<ans<<endl;
}