#include <iostream>
#include <fstream>
#define inf 20000000000000000
using namespace std;
ifstream fin("podm.in");
ofstream fout("podm.out");
long long  n,i,l,j,k,d[505][505],v[505];
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;
            d[i][j]=inf;
            for(k=i+1;k<j;k++){
                d[i][j]=min(d[i][k]+d[k][j]+v[i]*v[j]*v[k],d[i][j]);
            }
        }
   }
   fout<<d[1][n];
}