#include <bits/stdc++.h>

using namespace std;
ifstream fin("podm.in");
ofstream fout("podmn.out");

int main()
{
    int n,d[505][505]= {0},v[505]= {0};
    fin>>n;
    for (int i=0; i<=n; i++)
    {
        fin>>v[i];
    }
    for (int i=1; i<=n; i++)
    {
        d[i][i]=0;
        d[i][i+1]=v[i-1]*v[i]*v[i+1];
    }
    for (int k=2; k<=n-1; k++)
    {
        for (int i=1; i<=n-k; i++)
        {
            d[i][i+k]=1<<30;
            for (int l=i+1; l<=i+k; l++)
            {
                d[i][i+k]=min(d[i][i+k],d[i][l-1]+d[l][i+k]+v[i-1]*v[l-1]*v[i+k]);
            }
        }
    }
    fout<<d[1][n];
    return 0;
}