int pH;
scanf("%d", &pH);

if (pH > 7)
{
    if (pH < 12)
    {
        printf("Alkaline\n");
    }
    else // >= 12
    {
        printf("Very alkaline\n");
    }
}
else // pH <= 7
{
    if (pH != 7)
    {
        if (pH > 2)
        {
            printf("Acidic\n");
        }
        else // <= 2
        {
            printf("Very acidic\n");
        }
    }
    else // pH == 7
    {
        printf("Neutral\n");
    }
}