#include <fstream>

using namespace std;

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

const int NMAX = 505;

int v[NMAX];
long long dp[NMAX][NMAX];

int main()
{
    int n;
    fin >> n;
    for(int i = 1; i <= n + 1; i++)
    {
        fin >> v[i];
    }

    for(int i = n; i >= 1; i--)
    {
        for(int j = i + 1; j <= n; j++)
        {
            dp[i][j] = 1LL << 60;
            for(int k = i; k < j; k++)
            {
                long long q = dp[i][k] + dp[k+1][j] + (long long)v[i] * v[k+1] * v[j+1];
                dp[i][j] = min(dp[i][j], q);
            }
        }
    }
    fout << dp[1][n];

    return 0;
}