#include <iostream>
using name space std;
int n,i,v[101],ok,ok1,S=0,p1,p2;
int main()
{
cin>>n;
for (i=1; i<=n; i++)
cin>>v[i];
ok=0;
for (i=1; i<=n; i++)
if (v[i]%2==0)
{p1=i; break; ok=1;}
ok1=0;
for (i=n; i>=1; i--)
if (v[i]%2==0)
{p2=i; break; ok1=1;}
for (i=p1; i<=p2; i++)
S=S+v[i];
if (ok==0 && ok1==0)
cout<<"nu exista";
else cout<<S;
return 0;
}
sper că te-am ajutat