#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;
using P = pair<ll,ll>;
#define rep(i,n) for(int (i)=0;(i)<(n);(i)++)
#define rep2(i,m,n) for(int (i)=(m);(i)<(n);(i)++)
#define rep2ll(i,m,n) for(ll (i)=(m);(i)<(n);(i)++)
#define ALL(obj) (obj).begin(), (obj).end()
#define rALL(obj) (obj).rbegin(), (obj).rend()
const ll INF60 = 1LL<<60;//1152921504606846976
const int INF30 = 1<<30;
using mint = modint998244353;
using VL = vector<ll>;
using VVL = vector<VL>;
using VVVL = vector<VVL>;
using VM = vector<mint>;
using VVM = vector<VM>;
using VVVM = vector<VVM>;
using VD = vector<double>;
using VVD = vector<VD>;
using VVVD = vector<VVD>;
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }



int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    ll n; cin>>n;
    VL c(n+1, 0);
    ll m1; cin>>m1;
    ll now = 0;
    rep(i,m1){
        ll a; cin>>a;
        now += a;
        c[now] = 1;
    }
    ll m2; cin>>m2;
    rep(i,m2){
        ll b; cin>>b;
        now -= b;
        c[now] = 1;
    }
    ll ans = 0;
    rep2(i,1,n) ans += c[i]==0;
    cout<<ans;
    
    return 0;
}