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#include <fstream>
using namespace std;
ifstream fin("podm.in");
ofstream fout("podm.out");
long long d[502][502],a[502];
int i,j,n,z,x[502],l,k;
int main()
{
fin>>n;
for(i=0;i<=n;i++)
fin>>x[i];
for(l=2;l<=n;l++)
for(i=1;i<=n-l+1;i++)
{
j=i+l-1;
d[i][j]=1ll<<62;
for(k=i;k<j;k++)
d[i][j]=min(d[i][j],d[i][k]+d[k+1][j]+x[i-1]*x[k]*x[j]);
}
fout<<d[1][n];
return 0;
}