#include <fstream>
#include <climits>
using namespace std;
ifstream f("podm.in");
ofstream g("podm.out");
int n;
long long d[505], dp[505][505];
void citire()
{
    f >> n;
    for (int i = 0; i <= n; ++i)
        f >> d[i];
}
void dinamica()
{
    for (int lg = 1; lg < n; ++lg)
    {
        int imax = n - lg;
        for (int i = 1; i <= imax; ++i)
        {
            int j = i + lg;
            dp[i][j] = LLONG_MAX;
            for (int k = i; k < j; ++k)
                dp[i][j] = min(dp[i][j], dp[i][k] + dp[k + 1][j] + d[i - 1] * d[k] * d[j]);
        }
    }
}
int main()
{
    citire();
    dinamica();
    g << dp[1][n];
    return 0;
}