#include <bits/stdc++.h>

using namespace std;

const long long INF = 1e18;
long long dp[505][505],v[505];

int main()
{
    ifstream fin("podm.in");
    ofstream fout("podm.out");
    int n,j;
    fin >> n;
    for (int i = 0;i <= n;i++)
        fin >> v[i];
    for (int i = 1;i < n;i++)
        dp[i][i + 1] = v[i - 1] * v[i] * v[i + 1];
    for (int k = 2;k < n;k++) {
        for (int i = 1;i < n - k + 1;i++) {
            j = i + k;
            dp[i][j] = INF;
            for (int q = i;q < j;q++)
                dp[i][j] = min(dp[i][j], dp[i][q] + dp[q + 1][j] + v[i - 1] * v[q] * v[j]);
        }
    }
    fout << dp[1][n];
    return 0;
}