private void Window_Loaded(object sender, RoutedEventArgs e)
{
    OpenFileDialog dialog = new OpenFileDialog();
    dialog.ShowDialog();
    if (!String.IsNullOrEmpty(dialog.FileName))
    {
        StreamReader reader = File.OpenText(dialog.FileName);
        lineCount = Convert.ToInt32(reader.ReadLine());
        for (Int32 counter = 1; counter <= lineCount; counter++)
        {
            Result += String.Format("Case #{0}: {1}\n", counter, ProcessLine(reader.ReadLine()));
        }
    }
}
private Int32 ProcessLine(String input)
{
    Int32 minAmount = 10000;
    foreach (char character in "HACKERUP".ToCharArray())
    {
        Int32 count = (from c in input.ToCharArray() where c == character select c).Count();
        if (character == 'C')
        {
            decimal half = count / 2;
            count = Convert.ToInt32(Math.Floor(half));
        }
        if (count < minAmount)
        {
            minAmount = count;
        }
    }
    return minAmount;
}