#include <fstream>

#define NMAX 510
#define INF 100000000000000000LL

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

int n;
long long int v[NMAX];
long long int dp[NMAX][NMAX];

inline int min(int x, int y) {
    return x < y ? x : y;
}

int main() {
    fin >> n;
    for (int i = 0; i <= n; i++)
        fin >> v[i];

    for (int len = 2; len <= n; len++)
        for (int i = 1, j = 1 + len - 1; j <= n; i++, j++) {
            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] + v[i - 1] * v[k] * v[j]
                );
        }

    fout << dp[1][n] << '\n';
    fout.close();
    return 0;
}