#include <iostream>
#include<fstream>
using namespace std;

int  d[505],n;
int c[505][505];
void Citire()
{
    ifstream fin("podm.in");
    fin>>n;
    for(int i=0;i<=n;i++)
    fin>>d[i];
    fin.close();
}

void Rezolvare()
{
    for(int i=1;i<n;i++)
        c[i][i+1]=d[i-1]*d[i]*d[i+1];

    int x,j;
    int minim=1000000000;
    for(int pas=2;pas<=n;pas++)
    {
        for(int i=1;i<=n-pas+1;i++)
        {
            j=i+pas-1;
            minim=10000000;
            for(int k=i;k<j;k++)
            {
                x=c[i][k]+c[k+1][j]+d[i-1]*d[k]*d[j];
                if(x<minim) minim=x;
            }
            c[i][j]=minim;
        }
    }
    ofstream fout("podm.out");
    fout<<c[1][n]<<"\n";
    fout.close();
}

int main()
{
    Citire();
    Rezolvare();
    return 0;
}