#include <bits/stdc++.h>
#define ll long long
#define ull unsigned long long

using namespace std;

int main() {
    ios_base::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr);
    ll n;
    cin >> n;
    vector<ll>a(n);
    vector<ll>b(n);
    for (auto &i:a) cin >> i;
    for (auto &i:b) cin >> i;
    map<ll,ll>m;
    for (int i=0; i<n; i++) {
        m[a[i]-b[i]]++;
    }
    auto x=--m.rbegin();
    while (x!=m.rend()) {
        auto y= --x;
        x++;
        x->second += (y)->second;
        x++;
    }
    ll ans=0;
    for (int i=0; i<n; i++) {
        auto z=m.upper_bound(b[i]-a[i]);
        if (z!=m.end()) {
            ans+=z->second;
            if (b[i]<a[i]) ans--;
        }
    }
    cout << ans/2 << endl;
    return 0;
}