import os

def multiply_first_and_last(input_file, output_file):
    # Проверяем, существует файл data.txt
    if not os.path.exists(input_file):
        print(f"File {input_file} does not exist.")
        return

    # Считываем содержимое файла
    with open(input_file, 'r') as f:
        numbers = [int(line.strip()) for line in f.readlines()]
    
    if numbers:
        first_number = numbers[0]
        last_number = numbers.pop()
        result = first_number * last_number

        # Записываем полученный результата в result.txt
        with open(output_file, 'w') as f_out:
            f_out.write(str(result))

        print(f"Saved {first_number}х{last_number} to {output_file}")
    else:
        print(f"No numbers found in {input_file}")

if __name__ == "__main__":
    multiply_first_and_last('/var/result/data.txt', '/var/result/result.txt')