#include <fstream>
#define MIN(a, b) ((a) < (b) ? (a) : (b))
using namespace std;
ifstream f("podm.in");
ofstream g("podm.out");
unsigned long long n,d[502],c[502][502],pmax=9223372036854775807,i,j,l,k;
int main()
{
    f>>n;
    for(i=0;i<=n;i++)
        f>>d[i];
    for(i=1;i<n;i++)
        c[i][i+1] = d[i-1] * d[i] * d[i+1];
    for(l=2;l<n;l++)
        for(i=1;i<=n-l;i++)
        {
            int j=i+l;
            c[i][j]=pmax;
            for(k=i;k<j;k++)
                c[i][j]=MIN(c[i][j], c[i][k] + c[k+1][j] + d[i-1] * d[k] * d[j]);
        }
    g<<c[1][n];
    return 0;
}