#include <iostream>
#include <vector>

#define rep(i,n) for(int i = 0; i < (int)(n); i++)

using namespace std;

int main(){
    int N;
    cin >> N;
    vector<int> A(N), B(N);
    rep(i,N) cin >> A[i];
    rep(i,N) cin >> B[i];

    long long ans = 0;
    rep(l,N){
        for(int r = l + 1; r < N; r++){
            bool ok = true;
            for(int m = l; m < r; m++){
                if(A[r] - A[m] <= abs(B[r] - B[m])){
                    ok = false;
                    break;
                }
            }
            if(!ok) break;
            ans++;
        }
    }
    cout << ans << endl;

    return 0;
}