#include <fstream>
#include <vector>
#include <climits>
#define Nmax 502
using namespace std;

ifstream cin("podm.in");
ofstream cout("podm.out");

int n;
vector<int> sizes(Nmax);
vector<vector<long long>> dp(Nmax, vector<long long>(Nmax, LLONG_MAX));

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

    for(int i = 1; i<=n; i++)
        dp[i][i] = 0;

    for(int len = 2; len<=n; len++)
        for(int i = 1, j = len; i<=n && j<=n; i++, j++)
            for(int k = 1; k<=n; k++)  
                dp[i][j] = min(dp[i][j], dp[i][k] + dp[k+1][j] + sizes[i-1] * sizes[j] * sizes[k]);
            
    cout << dp[1][n];
}