#include<fstream>
#include<iostream>
using namespace std;
#define NMax 10001
#define INF 0x3f3f3f3f
ifstream f("podm.in");
ofstream g("podm.out");
long long m[NMax][NMax],d[NMax];
int n;
void pd()
{
    int nr,i,j,k;
    for(nr=2; nr<=n; nr++)
     for(i=1; i<=n-nr+1; i++)
     {
         j=i+nr-1;
         m[i][j]=INF;
         for(k=i; k<j; k++)
          if(m[i][j]>m[i][k]+m[k+1][j]+d[i]*d[k+1]*d[j+1])
          {
              m[i][j]=m[i][k]+m[k+1][j]+d[i]*d[k+1]*d[j+1];
          }
     }
}
int main()
{
    f>>n;
    for(int i=1;i<=n+1;i++)
    f>>d[i];
    pd();
    g<<m[1][n];
    return 0;
}