#include <iostream>

int evens_count(long long int num)
{
    int count = 0;
    int prev_checked = -1;
    bool counting = false;

    while (num >= 0)
    {
        if (prev_checked % 2 == 0)
        {
            if (num != 0 && num % 2 == 0)
            {
                counting = true;
                count++;
            }
            else if (counting)
            {
                counting = false;
                count++;
            }
        }
        if (num == 0)
            break;

        prev_checked = num % 10;
        num /= 10;
    }

    return count;
}

int main() {
  std::cout << evens_count(22);
}