#include <fstream>
#include <algorithm>
#include <cstring>
using namespace std;

ifstream fin("podm.in");
ofstream fout("podm.out");

int n;

long long M[505][505],v[505];

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

void PD()
{
    for(int d = 1; d < n; d++)
        for(int i=1; i<= n-d; i++)
        {
            int j = i + d;
            M[i][j]=999999999999999999999999999999999999999999999999999;
            for(int k = i ; k < j; k++)
                M[i][j] = min(M[i][j],M[i][k]+M[k+1][j]+v[i-1]*v[k]*v[j]);

        }
}


int main()
{
    citire();
    PD();
    fout<<M[1][n]<<"\n";
    return 0;
}