#include <fstream>
#define NMAX 510

using namespace std;
ifstream fin("podm.in");
ofstream fout("podm.out");
int n;
long long int d[NMAX];
long long int cmin[NMAX][NMAX];

void citire();
void pd();
void afisare();

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

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

void pd()
{int i, j, k, nr;
long long int minim;
 //initializare pentru 2 matrice
 for (i=1; i<n; i++)
     cmin[i][i+1]=d[i-1]*d[i]*d[i+1];
 for (nr=3; nr<=n; nr++)
     //calculez costul pentru toate secventele de nr matrice
     for (i=1; i<=n-nr+1; i++)
         {
          j=i+nr-1;
          minim=cmin[i+1][j]+d[i-1]*d[i]*d[j];
          for (k=i+1; k<j; k++)
               if (minim>cmin[i][k]+cmin[k+1][j]+d[i-1]*d[k]*d[j])
                  minim=cmin[i][k]+cmin[k+1][j]+d[i-1]*d[k]*d[j];
          cmin[i][j]=minim;
         }

}


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