def display_lines(file_path, num_lines):
    with open(file_path, 'r') as file:
        lines = file.readlines()
        for i in range(min(num_lines, len(lines))):
            print(lines[i], end='')

def calculate_word_frequency(file_path, word):
    with open(file_path, 'r') as file:
        text = file.read()
        word_count = text.lower().split().count(word.lower())
    return word_count

def main():
    file_path = input("Enter the name of the text file: ")
    try:
        with open(file_path, 'r') as file:
            pass
    except FileNotFoundError:
        print(f"The file {file_path} does not exist.")
        return
    
    num_lines = int(input("Enter the number of lines to display: "))
    display_lines(file_path, num_lines)
    
    word = input("\nEnter the word to calculate its frequency: ")
    frequency = calculate_word_frequency(file_path, word)
    print(f"The word '{word}' appears {frequency} times in the file.")

if __name__ == "__main__":
    main()