int usun_element()
{
    int element;
    struct list *usun;

    printf("Podaj numer do usuniecia: ");
    scanf("%d", &element;

    if(head->numer == element)
    {
        usun = head;
        head = usun->next;
    }

    else
    {
        wsk = head;

        while(wsk->next->numer != element)
            wsk = wsk->next;

        usun = wsk->next;
        wsk->next = wsk->next->next;
    }
    free(usun);
    return 1;
}