#include <bits/stdc++.h>

using namespace std;

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

long long v[505], d[505][505];

long long n, i, j, l, k;

int main()
{
    fin >> n;
    for(int i = 1; i <= n+1; i++)
        fin >> v[i];
    for(int i = 1; i <= n; i++)
        for(int j = 1; j <= n; j++)
            d[i][j] = (1LL << 62);
    for(int i = 1; i <= n; i++)
        d[i][i] = 0;
    for(int l = 2; l <= n; l++)
    {
        for(int i = 1; i+l-1 <= n; i++)
        {
            j = i + l - 1;

            for(int k = i; k < j; k++)
            {
                d[i][j] = min(d[i][j], d[i][k] + d[k+1][j] + v[i] * v[k+1] * v[j+1]);
            }
        }
    }

    fout << d[1][n] << "\n";
    return 0;
}