qword Random64()
{
	return MAKEQWORD(Random(), Random());
}

qword Random64(qword n)
{
	qword mask = n, r;
	mask |= mask >> 1;	mask |= mask >> 2;
	mask |= mask >> 4;	mask |= mask >> 8;
	mask |= mask >> 16;	mask |= mask >> 32;

	do
		r = Random64() & mask;
	while(r >= n);
	return r;
}

qword Random64(qword a, qword b)
{
	if (a == b)
		return a;
	if (a < b)
		return a + Random64(b - a + 1);
	return b + Random64(a - b + 1);
}