#include <fstream>
#include <climits>
#define  Min(a,b) ( (a) < (b) ? (a) : (b) )
#define Nmax 509
using namespace std;
ifstream f("podm.in");
ofstream g("podm.out");

int N,dim[Nmax];
unsigned long long Best[Nmax][Nmax];

int main()
{
    f>>N;
    for(int i=0;i<=N;++i)f>>dim[i];
    for(int i=1;i<=N;++i)Best[i][i]=0;
    for(int i=1;i<=N-1;++i)Best[i][i+1]=dim[i-1]*dim[i]*dim[i+1];
    for(int d=2;d<=N-1;++d)
      for(int i=1;i<=N-d;++i)
       {
            Best[i][i+d]=ULLONG_MAX;
            for(int j=i;j<=i+d;++j)
                Best[i][i+d]=Min(Best[i][i+d],Best[i][j]+Best[j+1][i+d]+dim[i-1]*dim[j]*dim[i+d]);
        }
    g<<Best[1][N]<<'\n';
    f.close();g.close();
    return 0;
}