#include <fstream>

using namespace std;

const int N = 500;
const int INF = 1 << 30;

int a[N + 1], dp[N][N];

int main() {
    ifstream in("podm.in");
    ofstream out("podm.out");

    int n;
    in >> n;
    for (int i = 0; i < n + 1; ++i)
        in >> a[i];
    
    for (int i = n - 1; i >= 0; --i)
        for (int j = i; j <= n - 1; ++j) {
            if (i == j)
                continue;
            dp[i][j] = INF;
            for (int k = i; k < j; ++k)
                dp[i][j] = min(dp[i][j], dp[i][k] + dp[k + 1][j] + a[i] * a[k + 1] * a[j + 1]);
        }

    out << dp[0][n - 1];

    in.close();
    out.close();
    return 0;
}