int main()
{
    long long n;
    cout << "Zadej bin: ";
    cin >> n;
    if (!cin.fail())
        {
        if (cin.peek() >= '2' && cin.peek() <='9')
        {
          cout << "hovno" << endl;
        }
          else
        {
          cout << convert(n);
        }
        }
    else cout << "Spatny vstup." << endl;

    return 0;