#include <bits/stdc++.h>
#include <iterator>
using namespace std;
#define rep(i, n) for(int i=0; i<n; i++)
#define debug 1
using ll = long long;
using ld = long double;
const int mod = 998244353;
const double pi = atan2(0, -1);
#include <time.h>
#include <chrono>

int main() {
	int N;
	cin >> N;
	vector<bool> stare(N + 1, false);
	stare[0] = true;
	int M1;
	cin >> M1;
	vector<int>A(M1);
	rep(i, M1) {
		cin >> A[i];
	}
	int M2;
	cin >> M2;
	vector<int>B(M2);
	rep(i, M2) {
		cin >> B[i];
	}
	int now = 0;
	rep(i, M1) {
		now += A[i];
		stare[now] = true;
	}
	rep(i, M2) {
		now -= B[i];
		stare[now] = true;
	}

	int ans = 0;
	rep(i, N + 1) {
		if (!stare[i]) {
			ans++;
		}
	}
	cout << ans << endl;
}