#include <fstream>
#include <algorithm>

using namespace std;

long long d[505],c[505][505];
int N;

inline void Read()
{
    int i;
    ifstream fin("podm.in");
    fin>>N;
    for(i=0;i<=N;i++)
        fin>>d[i];
    fin.close();
}

inline void Solve()
{
    int i,j,k,pas;
    long long x;
    for(i=1;i<N;i++)
        c[i][i+1]=d[i-1]*d[i]*d[i+1];

    for(pas = 3;pas<=N;pas++)
        for(i=1;i<=N - pas + 1;i++)
        {
            j= i+pas-1;
            x=10000000000000000LL;
            for(k=i;k<j;k++)
                x=min(x,c[i][k]+c[k+1][j]+d[i-1]*d[k]*d[j]);
            c[i][j]=x;
        }
    ofstream fout("podm.out");
    fout<<c[1][N]<<"\n";
    fout.close();
}

int main()
{
    Read();
    Solve();
    return 0;
}