#include <fstream>
#define DMAX 1000
#define INF 2000000000

using namespace std;

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

int n;
int d[DMAX];
int nrmin[DMAX][DMAX];

void citire();
void rezolvare();
void afisare();

int main()
{
citire();
rezolvare();
afisare();
    return 0;
}

void afisare()
{
fout<<nrmin[1][n]<<'\n';
}

void rezolvare()
{
int i,j,k,lg,minim,kmin;
for (i=1;i<n;i++) nrmin[i][i+1]=d[i-1]*d[i]*d[i+1];
for (lg=3;lg<=n;lg++)
     for (i=1;i<=n-lg+1;i++)
         {
          j=i+lg-1; minim=INF;
          for (k=i;k<j;k++)
               if (minim>nrmin[i][k]+nrmin[k+1][j]+d[i-1]*d[k]*d[j])
                   {
                    minim=nrmin[i][k]+nrmin[k+1][j]+d[i-1]*d[k]*d[j];
                    kmin=k;
                   }
          nrmin[i][j]=minim; nrmin[j][i]=kmin;
         }
}

void citire()
{
int i;
fin>>n;
for (i=0;i<=n;i++) fin>>d[i];
}