11-3

#include <stdio.h>

int main()
{
    int arr[28];
    for (int i = 0; i < 28; ++i) {
        scanf("%d", &arr[i]);
    }

    int sum = 0;
    for (int i = 0; i < 28; ++i) {
        if (arr[i] % 2 != 0 && i % 2 == 0) {
            sum += arr[i];
        }
    }

    printf("%d", sum);

    return 0;
}