#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,nr,j,k;
 long long int minim;
 //initializarea pentru 2 matrice
 for (i=1;i<n;i++)
     cmin[i][i+1]=d[i-1]*d[i]*d[i+1];
 //calculez costul pentru toate secentele de matrice
 for (nr=3;nr<=n;nr++)
    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';
}