include include

int main() {
const int size = 7;
int B[size];
int sum = 0;

srand(time(0));
for (int i = 0; i < size; ++i) {
B[i] = rand() % 20 - 12;
std::cout << "B[" << i << "] = " << B[i] << std::endl;
}
for (int i = 0; i < size; i += 2) {
sum += B[i];
}
std::cout << "Сумма элементов с четными индексами: " << sum << std::endl;
return 0;

}