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

int main(){
	int n;
	cin >> n;
	int m1;
	cin >> m1;
	set<int> s;
	s.insert(0);
	vector<int> a(m1);
	for(int i = 0;i < m1;i++){
		cin >> a[i];
		if(i != 0) a[i] += a[i - 1];
	}
	int m2;
	cin >> m2;
	vector<int> b(m2 + 1);
	b[0] = n;
	for(int i = 1;i <= m2;i++){
		cin >> b[i];
		b[i] = b[i - 1] - b[i];
	}
	for(int i = 0;i < m1;i++) s.insert(a[i]);
	for(int i = 0;i <= m2;i++) s.insert(b[i]);
	cout << n + 1 - (int)s.size();
	
}