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#include <fstream>
#define MAX 507
using namespace std;
ifstream fin("podm.in");
ofstream fout("podm.out");
int n;
long long int d[MAX];
long long int cmin[MAX][MAX];
void afisare();
void pd();
int main()
{ int i;
fin>>n;
for(i=0;i<=n;i++)
fin>>d[i];
pd();
fout<<cmin[1][n];
return 0;
}
void pd()
{
int i,j,k,nr;
long long int minim;
for(i=1;i<n;i++)
cmin[i][i+1]=d[i-1]*d[i]*d[i+1];
for(nr=3;nr<=n;nr++)
for(i=1;i<=n-nr+1;i++)
{
j=i+nr-1;
minim=cmin[i+1][j]+d[i-1]*d[i]*d[j];
for(k=i+1;k<j;k++)
if(minim>cmin[i][k]+cmin[k+1][j]+d[i-1]*d[k]*d[j])
minim=cmin[i][k]+cmin[k+1][j]+d[i-1]*d[k]*d[j];
cmin[i][j]=minim;
}
}