#pragma once

#include <bits/stdc++.h>

#define M_PI       3.14159265358979323846   // pi

using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef vector<int> VI;
typedef pair<ll, ll> P;
typedef tuple<ll, ll, ll> t3;

#define rep(a,n) for(int a = 0;a < n;a++)
#define repi(a,b,n) for(int a = b;a < n;a++)

const ull mod = 1000000007;

int main(void)
{
	ll n;
	cin >> n;
	vector<ll> as(n+1);
	vector<ll> bs(n+1);
	vector<ll> ds(n);
	rep(i, n + 1) cin >> as[i];
	rep(i, n + 1) cin >> bs[i];
	rep(i, n) cin >> ds[i];

	vector<ll> p(n);
	int a = 0;
	int b = 0;
	rep(i, n) {
		if (as[a + 1] + bs[b] < as[a] + bs[b + 1]) {
			b++;
		}
		else {
			a++;
		}
		p[i] = as[a] + bs[b];
	}
	int sum = 0;
	rep(i, n) {
		if (p[i] >= ds[i]) {
			sum++;
		}
	}
	cout << sum << endl;
	return 0;
}