#include <bits/stdc++.h>
using namespace std;
int main(){
  int N;
  cin >> N;
  vector<bool> used(N + 1, false);
  used[0] = true;
  int M1;
  cin >> M1;
  int p = 0;
  for (int i = 0; i < M1; i++){
    int A;
    cin >> A;
    p += A;
    used[p] = true;
  }
  int M2;
  cin >> M2;
  for (int i = 0; i < M2; i++){
    int B;
    cin >> B;
    p -= B;
    used[p] = true;
  }
  int ans = 0;
  for (int i = 0; i <= N; i++){
    if (!used[i]){
      ans++;
    }
  }
  cout << ans << endl;
}