#include <fstream>
#include <climits>

using namespace std;

ifstream f("podm.in");
ofstream g("podm.out");

int n;
long long d[505], dp[505][505];

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

void dinamica() {
    for (int dis = 1; dis < n; ++dis)
        for (int i = 1; i <= n - dis; ++i) {
            dp[i][i + dis] = LONG_LONG_MAX;
            for (int k = i; k < i + dis; ++k)
                dp[i][i + dis] = min(dp[i][i + dis], dp[i][k] + dp[k + 1][i + dis] + d[i - 1] * d[k] * d[i + dis]);
        }
}

int main() {
    citire();
    dinamica();
    g << dp[1][n];
    return 0;
}