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

ifstream fin("psir.in");
ofstream fout("psir.out");

unsigned int f[2001][2001];
int n, v[2001], sorted[2001];
const long long mod = pow(2, 32);
int l, r, m, pos;

int main()
{
    fin >> n;

    for (int i = 1; i <= n; i++)
        fin >> sorted[i], v[i] = sorted[i];

    sort(sorted + 1, sorted + n + 1);

    for (int i = 1; i <= n; i++)
    {
        l = 1, r = n;

        while (l <= r)
        {
            m = (l + r) >> 1;

            if (sorted[m] >= v[i])
            {
                pos = m;
                r = m - 1;
            }
            else
                l = m + 1;
        }

        v[i] = pos;
    }

    unsigned int res = 0;

    for (int i = 1; i <= n; i++)
    {
        fin >> v[i];

        for (int j = i - 1; j >= 1; j--)
        {
            if (v[j] < v[i])
                f[i][v[j]] += 1 + f[j][2000] - f[j][v[i]];
            else
                f[i][v[j]] += f[j][v[i] - 1] + 1;
        }

        for (int j = 1; j <= 2000; j++)
            f[i][j] += f[i][j - 1];

        res += f[i][2000];
    }

    fout << res;
    
    return 0;
}