#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 pt 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 pt 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';
}