#include <fstream>
#include <vector>

using namespace std;

const long long INF = 1LL << 60;

int main()
{
    ifstream in("podm.in");
    ofstream out("podm.out");
    int n;
    in >> n;
    vector <int> nr(n + 2);
    for (int i = 1; i <= n + 1; i++)
    {
        in >> nr[i];
    }
    vector < vector <long long>> dp(n + 1);
    for (int i = 1; i <= n; i++)
    {
        vector <long long> aux (n + 1, 0);
        dp[i] = aux;
    }
    for (int i = n - 1; i >= 1; i--)
    {
        for (int j = i + 1; j <= n; j++)
        {
            dp[i][j] = INF;
            for (int k = i; k < j; k++)
            {
                dp[i][j] = min(dp[i][j], dp[i][k] + dp[k+1][j] + (long long)nr[i] * nr[k+1] * nr[j+1]);
            }
        }
    }
    out << dp[1][n] << "\n";
    in.close();
    out.close();
    return 0;
}