#include <iostream>
using namespace std;
int main(){
int n, v[100];
cin >> n;
for (int i = 1; i <= n; ++i) {
cin >> v[i];
}
int primaPozitie = -1, ultimaPozitie;
for (int i = 1; i <= n; ++i) {
if (v[i] % 2 == 0) {
if (primaPozitie == -1) {
primaPozitie = i;
}
ultimaPozitie = i;
}
}
int suma = 0;
for (int i = primaPozitie; i <= ultimaPozitie; ++i) {
suma += v[i];
}
cout << suma;
return 0;
}
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