#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll=int;
using ld=long double;
ld pie=3.14159265359;
ll inf=1001;
ll mod=998244353;
int main(){
	ll n;
	cin >> n;
	vector<ll>a(n),b(n);
	for (ll i = 0; i < n; i++)
	{
		cin >> a[i];
	}
	for (ll i = 0; i < n; i++)
	{
		cin >> b[i];
	}
	ll ans=0;
	vector<ll>memo(n,0);
	for (ll i = 1; i < n; i++)
	{
		if (a[i]+min(b[i],b[i-1])<=a[i-1]+max(b[i],b[i-1]))
		{
			memo[i]=i;
		}else{
			memo[i]=memo[i-1];
			ans+=i-memo[i];
		}
	}
	cout << ans << endl;
}