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#include <fstream>
using namespace std;
ifstream in ("oo.in");
ofstream out ("oo.out");
int s[100001];
int main()
{
bool ok=1;
int c,i,a,b,smax=0,pozmax,scrt=0,n;
in>>n>>a;
c=a;
for(i=1;i<n;i++)
{
in>>b;
s[i]=a+b;
a=b;
}
s[n]=a+c;
for(i=1;ok&&i<=n;i++)
{
smax=0;
for(int j=1;j<=n;j++)
{
if(s[j]>smax)
{
smax=s[i];
pozmax=i;
}
}
if(smax==0)
ok=0;
else
{
scrt+=smax;
s[pozmax]=0;
if(pozmax==0)
{
s[n]=0;
s[pozmax+1]=0;
}
else
{
if(pozmax==n)
{
s[1]=0;
s[pozmax-1]=0;
}
else
{
for(i=pozmax-1;i<=pozmax+1;i++)
s[i]=0;
}
}
}
}
out<<scrt;
return 0;
}