#include<fstream>
#define INF 18446744073709551615
#include<cmath>
using namespace std;
ifstream f("podm.in");
ofstream g("podm.out");
unsigned long long m[505][505];
int i,n,l,k,j;
int v[505];
int main()
{
    f>>n;
    for (i=0;i<=n;++i) f>>v[i];
    for (l=2;l<=n;++l)
        for (i=1;i<=n-l+1;++i)
        {
            j=i+l-1;
            m[i][j]=INFINITY;
            for (k=i;k<=j-1;++k)
                {
                    unsigned long long q=m[i][k]+m[k+1][j]+v[i-1]*v[k]*v[j];
                    if (q<m[i][j]) m[i][j]=q;
                }
        }
    g<<m[1][n]<<'\n';
}