#include <bits/stdc++.h>
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];
	}
	vector<int> C = {0};
	bool ok = true;
	for (int i = 0; i < N - 1; i++){
		if (A[i + 1] - A[i] > abs(B[i + 1] - B[i])){
			if (ok){
				C.push_back(0);
				ok = false;
			}
			C.back()++;
		} else {
			ok = true;
		}
	}
	C.back()++;
	long long ans = 0;
	for (int i : C){
		ans += (long long) i * (i - 1) / 2;
	}
	cout << ans << '\n';
}