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

int main(){
	
	int n;
	cin >> n;

	bitset <300000> bit;
	
	int m1;
	cin >> m1;
	int now = 0;

	for(int i = 0; i < m1; ++i){
		int a;
		cin >> a;
		now += a;
		bit[now] = 1; 
	}

	int m2;
	cin >> m2;
	for(int i = 0; i < m2; ++i){
		int a;
		cin >> a;
		now -= a;
		bit[now] = 1; 
	}
	
	int ans = 0;
	for(int i = 0; i < n + 1; ++i){
		if(!bit[i]) ans ++;
	}
	
	cout << ans << endl;
	
}