#include <bits/stdc++.h>
#include <iostream>
#include <vector>
#include <algorithm>
//#include <atcoder/all>

//using namespace atcoder;
using namespace std;

#define reps(i, a, n) for (int i = (a); i < (int)(n); ++i)
#define rep(i, n) reps(i, 0, n)
#define repe(i,n) for(auto i : n)

#define ALL(x) x.begin(),x.end() 
#define SIZE(x) ll(x.size()) 

#define INF32 2147483647 //2.147483647×10^{9}:32bit整数のinf
#define INF64 9223372036854775807 //9.223372036854775807×10^{18}:64bit整数のinf
#define MOD 1000000000 + 7 //問題による

#define F first
#define S second

#define cYes cout << "Yes" << endl;
#define cNo cout << "No" << endl;

#define coutALL(x) for(auto i=x.begin();i!=--x.end();i++)cout<<(*i)<<" ";cout<<*--x.end()<<endl;
#define coutALL2d(vv) for(const auto& v : vv){for(const auto& e : v){cout << e << " ";}cout << endl;}
#define cout2(x,y) cout << x << " " << y << endl;
#define cout3(x,y,z) cout << x << " " << y << " " << z << endl;

#define ll long long
#define vmax(x) *max_element(x.begin(), x.end())
#define vmin(x) *min_element(x.begin(), x.end())

#define vi vector<int>
#define vvi vector<vector<int> >
#define vll vector<long long>
#define vvll vector<vector<long long> >

#include <iostream>
#include <vector>
#include <algorithm>
 
#include <stdio.h>
#include <stdbool.h>
#include <string>

int main(){
  int n;
  cin >> n;
  int m1,m2;
  cin >> m1;
  vi a(m1);
  rep(i,m1) cin >> a[i];

  cin >> m2;
  vi b(m2);
  vi visited(n+1);
  rep(i,m2) cin >> b[i];
  int sm = 0;
  rep(i,m1){
    sm += a[i];
    visited[sm] = 1;
  }
  sm = n;
  rep(i,m2){
    sm -= b[i];
    visited[sm] = 1;
  }
  int cnt = n;
  rep(i,n){
    if(visited[i] == 1){
      cnt--;
    }
  }
  cout << cnt << endl;
}