#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 doua 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';
}