#include<fstream>
#define LL long long
using namespace std;
int n;
LL q,a[502],d[502][502];
ifstream f("podm.in");
ofstream g("podm.out");
int main()
{
    f>>n;
    for(int i=1;i<=n+1;i++)
        f>>a[i];
    for(int i=n;i>=1;i--)
        for(int j=i+1;j<=n;j++)
        {
            d[i][j]=d[i][i]+d[i+1][j]+a[i]*a[i+1]*a[j+1];
            for(int k=i+1;k<j;k++)
            {
                q=d[i][k]+d[k+1][j]+a[i]*a[k+1]*a[j+1];
                if(q<d[i][j])
                    d[i][j]=q;
            }
        }
    g<<d[1][n];
    return 0;
}