#include <fstream>

using namespace std;

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

const int MAX = 501;
const long long INF = (1ll << 62);
long long n, a[MAX], dp[MAX][MAX];

int main()
{
    in>>n;
    for(int i=1; i<=n+1; i++)
        in>>a[i];

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

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