#include <fstream>
#define INF 100000000000000000LL
using namespace std;
long long m[505][505],n,i,k,j,p[505],l;
int main()
{
    ifstream fi("podm.in");
    ofstream fo("podm.out");
    fi>>n;
    for(i=1;i<=n+1;i++) fi>>p[i], m[i][i]=0;
    for(l=2;l<=n;l++)
      for(i=1;i<=n-l+1;i++)
        {
            j=i+l-1;
            m[i][j]=INF;
            for(k=i+1;k<=j;k++)
            if(m[i][j]>m[i][k-1]+m[k][j]+p[i]*p[k]*p[j+1])
              m[i][j]=m[i][k-1]+m[k][j]+p[i]*p[k]*p[j+1];
            j=1;
        }
    fo<<m[1][n];
    return 0;
}