#include <bits/stdc++.h>
using namespace std;

int main() {
	int N;
	cin >> N;
	int M1;
	cin >> M1;
	vector<int> A(M1);
	for (int i = 0; i < M1; i++){
		cin >> A[i];
	}
	int M2;
	cin >> M2;
	vector<int> B(M2);
	for (int i = 0; i < M2; i++){
		cin >> B[i];
	}
	vector<bool> flg(N + 1);
	flg[0] = true;
	int c = 0;
	for (int i = 0; i < M1; i++){
		c += A[i];
		flg[c] = true;
	}
	for (int i = 0; i < M2; i++){
		c -= B[i];
		flg[c] = true;
	}
	cout << count(flg.begin(), flg.end(), false) << '\n';
}