#include <iostream>
#include <fstream>
#include <limits>
#include <algorithm>
#define MAXN 500

#define IN_FILENAME "podm.in"
#define OUT_FILENAME "podm.out"


long long dp[MAXN][MAXN];

int dimensions[MAXN + 1];

int main() {

    std::ifstream input(IN_FILENAME);

    int n;
    input >> n;

    for (int i = 0; i < n + 1; i++) {
        input >> dimensions[i];
    }


    for (int l = 1; l < n; l++) {
        for (int i = 0; i < n - l; i++) {
            int j = i + l;
            dp[i][j] = std::numeric_limits <long long>::max();
            for (int k = i; k < j; k++) {
                dp[i][j] = std::min(dp[i][j],
                                    dp[i][k] + dp[k + 1][j] + 1LL * dimensions[i] * dimensions[k + 1] * dimensions[j + 1]);
            }
        }
    }


    std::ofstream output(OUT_FILENAME);

    output << dp[0][n - 1];
}