#include <fstream>
#define INF 2000000000
using namespace std;
ifstream f("podm.in");
ofstream g("podm.out");
long long n,i,j,k,l,d[505][505],a[505],y,minim;
int main()
{
    f>>n;
    n++;
    for(i=1;i<=n;i++)
        f>>a[i];
    for(l=2;l<n;l++){
        for(i=1;i+l<=n;i++){
            j=i+l;
            d[i][j] = INF;
            for(k=i;k<j;k++){
              d[i][j] = min(d[i][j],d[i][k] + d[k][j]+ a[i]*a[j]*a[k]);

            }
        }
    }
         g<<d[1][n];
    return 0;
}