#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 afisare();
void pd();
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;
    for(i=1;i<n;i++)//pt 2 matrice
cmin[i][i+1]=d[i-1]*d[i]*d[i+1];
for(nr=3;nr<=n;nr++)
//calculez cost pt toate secv pt 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';
}