#include <fstream>
#define infinit 1000000000000000000ll
using namespace std;
ifstream fin("podm.in");
ofstream fout("podm.out");
int n,k,kmin,i,j,lg;
long long int d[503], nrmin[503][503],minn;
int main()
{
    fin>>n;
    for (i=0;i<=n;i++)
      fin>>d[i];
    for (i=1;i<=n;i++)
      nrmin[i][i]=0;
    for (i=1;i<=n-1;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;
            minn=infinit;
            for (k=i;k<=j-1;k++)
               {
                  if (minn>nrmin[i][k]+nrmin[k+1][j]+d[i-1]*d[k]*d[j])
                     {minn=nrmin[i][k]+nrmin[k+1][j]+d[i-1]*d[k]*d[j];
                     kmin=k;}
               }
            nrmin[i][j]=minn;
            nrmin[j][i]=kmin;
         }
    fout<<nrmin[1][n]<<'\n';
    return 0;
}