#include <iostream>
#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];
long long int minim;
void citire();
void afisare();
void pd();
int main()
{
    citire();
    pd();
    afisare();
    return 0;
}
void citire()
{
    fin>>n;
    for(int i =0 ; i<=n;i++)
    {
        fin>>d[i];
    }
}
void pd()
{
    //initializre pentru 2 matrice
    for(int i =1; i<n;i++)
    {
        cmin[i][i+1]=d[i-1]*d[i]*d[i+1];
    }
    for(int nr=3;nr<=n;nr++)
    {
        //calculez costul pentru toate secventele de nr matrice
        for(int i=1;i<=n-nr+1;i++)
        {
            int j=i+nr-1;
            minim=cmin[i+1][j]+d[i-1]*d[i]*d[j];
            for(int k=i;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';
}