#include <fstream>
using namespace std;
string file = "podm";
ifstream cin(file + ".in");
ofstream cout(file + ".out");
long long dp[501][501], dim[502];
const long long INF = 1e9;
int main()
{
    int n;
    cin >> n;
    for (int i = 1; i <= n+1; i++)
    {
        cin >> dim[i];
    }
    for (int i = n; 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] + dim[i] * dim[k + 1] * dim[j + 1]);
            }
        }
    }
    cout << dp[1][n];
}