#include <iostream>
#include <fstream>

using namespace std;

ifstream in("podm.in");
ofstream out("podm.out");

const int NMAX = 5 * 1e2;

long long n;
long long d[1 + NMAX];
long long cmin[1 + NMAX][1 + NMAX];

int main()
{
    in >> n;

    for(int i = 0; i <= n; i++)
        in >> d[i];

    for(int i = 1; i < n; i++)
        cmin[i][i + 1] = d[i - 1] * d[i] * d[i + 1];

    for(int lg = 2; lg <= n - 1; lg++)
    {
        for(int i = 1; i <= n - lg; i++)
        {
            int j = i + lg;

            cmin[i][j] = cmin[i][i] + cmin[i + 1][j] + d[i - 1] * d[i] * d[j];

            for(int k = i + 1; k <= j - 1; k++)
                cmin[i][j] = min(cmin[i][j], cmin[i][k] + cmin[k + 1][j] + d[i - 1] * d[k] * d[j]);

        }
    }

    out << cmin[1][n] << '\n';

    in.close();
    out.close();

    return 0;
}