#include <bits/stdc++.h>
#define int unsigned long long

using namespace std;
int n;
vector<vector<int>> dp(505, vector<int>(505, LONG_LONG_MAX));
int d[505];

signed main()
{

    ifstream cin("podm.in");
    ofstream cout("podm.out");

    cin >> n;
    for (int i = 0; i <= n; ++i)
    {
        cin >> d[i];
    }

    for (int i = 1; i <= n; ++i)
    {
        dp[i][i] = 0;
        if (i > 1)
            dp[i][i + 1] = d[i - 1] * d[i] * d[i + 1];
    }

    for (int len = 2; len <= n; ++len)
        for (int i = 1; i + len - 1 <= n; ++i)
        {
            int j = i + len - 1;
            for (int k = i; k < j; ++k)
            {

                // cout << dp[i][j] << ' ';
                dp[i][j] = min(dp[i][j], dp[i][k] + dp[k + 1][j] + d[i - 1] * d[k] * d[j]);
            }
        }

    cout << dp[1][n];

    return 0;
}