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#include <fstream>
using namespace std;
long long d[505],n;
ifstream fin("podm.in");
ofstream fout("podm.out");
void citire()
{
fin>>n;
for(int i=0;i<=n;i++)
fin>>d[i];
}
long long m[505][505];
int main()
{
citire();
for(int i=1;i<=n;i++)
a[i][i]=0;
for(int x=2;x<n;x++)
for(int j=x;j<=n;j++)
{
int i=j-1;
long long Min=m[i][i]+m[i+1][j]+(d[i-1]*d[i]*d[j]);
for(int k=i+1;k<j;k++)
{
long long s=m[i][k]+m[k+1][j]+(d[i-1]*d[k]*d[j]);
if(s<Min)
Min=s;
}
m[i][j]=Min;
}
long long Min=m[1][1]+m[1+1][n]+(d[1-1]*d[1]*d[n]);
for(int k=1+1;k<n;k++)
{
long long s=m[1][k]+m[k+1][n]+(d[1-1]*d[k]*d[n]);
if(s<Min)
Min=s;
}
fout<<Min
return 0;
}