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

int main() {
	int N;
	cin >> N;
	vector<int> A(N);
	for (int i = 0; i < N; i++){
		cin >> A[i];
	}
	vector<int> B(N);
	for (int i = 0; i < N; i++){
		cin >> B[i];
	}
	atcoder::dsu uf(N);
	for (int i = 0; i < N - 1; i++){
		if (A[i + 1] - A[i] > abs(B[i + 1] - B[i])){
			uf.merge(i, i + 1);
		}
	}
	long long ans = 0;
	for (auto s : uf.groups()){
		int m = s.size();
		ans += (long long) m * (m - 1) / 2;
	}
	cout << ans << '\n';
}