#include <iostream>
#include <algorithm>
using namespace std;

int a[200009], b[200009];

int main()
{
	ios::sync_with_stdio(false);
	cin.tie(0);
	int n; cin >> n;
	for (int i = 1; i <= n; i++) cin >> a[i];
	for (int i = 1; i <= n; i++) cin >> b[i];
	int c = 0;
	long long ans = 0;
	for (int i = 1; i <= n; i++) {
		c++;
		if (i == n || a[i] + b[i] >= a[i + 1] + b[i + 1] || a[i] - b[i] >= a[i + 1] - b[i + 1]) {
			ans += 1LL * c * (c - 1) / 2LL;
			c = 0;
		}
	}
	cout << ans << '\n';
	return 0;
}