unsigned long long ADC(unsigned long long * a, unsigned long long * b, bool * carry)
{
    unsigned long long result;
    unsigned char * pr = (unsigned char *) &result;
    unsigned char * pa = (unsigned char *) a;
    unsigned char * pb = (unsigned char *) b;
    unsigned short temp = (carry) ? 1 : 0;
    for (int i = 0; i < 8; i++)
    {
        temp += *pa++;
        temp += *pb++;
        *pr++ = (unsigned char) temp;
        temp >>= 8;
    }

    *carry = (temp != 0);
    return result;
}