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#include<fstream>
using namespace std;
ifstream in("expresie.in");
ofstream out("expresie.out");
long long v[1005],n,nr,suma=0;
int main ()
{
long long nr=1,max=0,aux,i,j;
in>>n;
for(i=1;i<=n;i++)
{
in>>v[i];
suma+=v[i];
}
for(i=1;i<=n-2;i++)
{
nr=v[i]*v[i+1]*v[i+2];
aux=suma-v[i]-v[i+1]-v[i+2]+nr;
if(aux>max)
max=aux;
}
for(i=1;i<=n-3;i++)
{
for(j=i+2;j<n;j++)
{
nr=1;
nr=v[i]*v[i+1]+v[j]*v[j+1];
aux=suma-v[i]-v[i+1]-v[j]-v[j+1]+nr;
if(aux>max)
max=aux;
}
}
out<<max;
return 0;
}