#include <bits/stdc++.h>
#define ll long long
using namespace std;

#define inf 1e13
ll dp[505][505], v[505], n;
ifstream fin("podm.in");
ofstream fout("podm.out");

int main()
{

    fin >> n;
    for (int i = 0; i <= n; ++i)
        fin >> v[i];

    for (int i = 1; i <= n; ++i)
        dp[i][i] = 0;

    for(int len = 2; len <= n; ++len)
    {
        for(int i = 1; i <= n - len + 1; ++i)
        {
            int j = i + len - 1;
            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] + v[i-1] * v[k] * v[j]);
            }
        }
    }

    fout << dp[1][n] << '\n';
    return 0;
}