#include <bits/stdc++.h>
#define NMAX 510
using namespace std;
ifstream fin("podm.in");
ofstream fout("podm.out");
int n, i, j, k, nr;
long long int cmin[NMAX][NMAX], minim, d[NMAX];

void citire()
{
    fin>>n;
    for(i=0; i<=n; i++)
        fin>>d[i];
}

void pd()
{
    //init pt 2 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';
}


int main()
{
    citire();
    pd();
    afisare();
    return 0;
}