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#include <fstream>
#define INF 10000000000000000
using namespace std;
ifstream fin ("podm.in");
ofstream fout("podm.out");
long long n,V[502],D[502][502],i,j,k,l;
int main()
{
fin>>n;
n++;
for(i=1;i<=n;i++)
fin>>V[i];
for(i=1;i<n;i++)
D[i][i+1] = 0;
for(l=3;l<=n;l++)
for(i=1;i+l-1<=n;i++)
{
j=i+l-1;
D[i][j]=INF;
for(k=i+1;k<j;k++)
D[i][j]=min(D[i][j],D[i][k]+D[k][j]+V[i]*V[k]*V[j]);
}
fout<<D[1][n];
return 0;
}