#include <bits/stdc++.h>
#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,nr,k,j;
    long long int minim;
    ///initializare 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';
}