#include <fstream>

constexpr int N = 500;
int a[N + 1];
long long dp[N][N];

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

    int n;
    in >> n;
    for (int *p = a; p != a + n + 1; ++p)
        in >> *p;

    for (int i = n - 1; i >= 0; --i)
        for (int j = i; j < n; ++j) {
            if (i == j)
                continue;
            dp[i][j] = 1ll << 62;
            for (int k = i; k < j; ++k)
                dp[i][j] = std::min(dp[i][j], dp[i][k] + dp[k + 1][j] + static_cast<long long>(a[i]) * a[k + 1] * a[j + 1]);
        }

    out << dp[0][n - 1] << '\n';
}