# include <fstream>
# define DIM  510
# define INF 1000000000000
using namespace std;
ifstream fin("podm.in");
ofstream fout("podm.out");
int v[DIM],i,j,l,k,n;
long long m[DIM][DIM];
int main () {
    fin>>n;
    n++;
    for(i=1;i<=n;i++)
        fin>>v[i];
    for(l=3;l<=n;l++){
        for(i=1;i+l-1<=n;i++){
            j=i+l-1;
            m[i][j]=INF;
            for(k=i+1;k<=j-1;k++){
                m[i][j]=min(m[i][j],m[i][k]+m[k][j]+v[i]*v[k]*v[j]*1LL);
            }
        }
    }
    fout<<m[1][n]<<"\n";
    return 0;
}