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

#include <atcoder/all>
using namespace atcoder;

int main() {
	int N;
	cin >> N;
	int M1;
	cin >> M1;
	set<int> S;
	vector<int> A(M1);
	for( int i = 0; i < M1; i++ ) {
		cin >> A[i];
		if( i > 0 ) A[i] += A[i-1];
		S.insert(A[i]);
	}
	int M2;
	cin >> M2;
	vector<int> B(M2);
	for( int i = 0; i < M2; i++ ) {
		cin >> B[i];
		if( i > 0 ) B[i] += B[i-1];
		S.insert(N-B[i]);
	}
	cout << N+1-S.size() << endl;
}