#include <fstream>
#include <climits>

using namespace std;

int n;
long long a[505], b[505][505];

void Citire()
{
    ifstream fin("podm.in");
    fin >> n;
    for (int i = 0; i <= n; ++i)
        fin >> a[i];
    for (int i = 0; i <= n; ++i)
        for (int j = 0; j <= n; ++j)
            b[i][j] = 0x3f3f3f3f;
}

long long Min(long long a, long long b)
{
    if (a < b)
        return a;
    return b;
}

void Matrice()
{
    int j;
    for (int i = 1; i <= n; ++i)
        b[i][i] = 0;
    for (int i = 1; i < n; ++i)
        b[i][i + 1] = a[i - 1] * a[i] * a[i + 1];
    for (int tz = 2; tz <= n; ++tz)
    {
        for (int i = 1, j = tz; j <= n; ++i, ++j)
        {
            for (int k = i; k <= j; ++k)
                b[i][j] = Min(b[i][j], b[i][k] + b[k + 1][j] + a[i - 1] * a[k] * a[j]);
        }
    }
}

void Afisare()
{
    ofstream fout("podm.out");
    fout << b[1][n];
}

int main()
{
    Citire();
    Matrice();
    Afisare();
    return 0;
}