#include <bits/stdc++.h>
#define NMAX 505
#define inf 10000000000000000000
using namespace std;
typedef unsigned long long ll;
string file="podm";

ifstream fin(file+".in");
ofstream fout(file+".out");

int n;
ll d[NMAX];
ll sol[NMAX][NMAX];

int main() {
    fin >> n;
    for (int i = 0; i <= n; i++)
        fin >> d[i];
    for (int i = 1; i < n; i++)
        sol[i][i + 1] = d[i - 1] * d[i] * d[i + 1];
    for (int k = 2; k < n; k++) {
        for (int i = 1; i <= n - k; i++) {
            int j = i + k;
            sol[i][j] = inf;
            for (int jj = i; jj < j; jj++) {
                sol[i][j] = min(sol[i][j], sol[i][jj] + sol[jj + 1][j] + d[i - 1] * d[jj] * d[j]);
            }
        }
    }
    fout << sol[1][n];
    return 0;
}