"""
Exercise 4.3 from "A primer on..." 
Read a single number from a file containing
text and numbers.
"""



with open('Fdeg0.txt', 'r') as infile:
    infile.readline()
    infile.readline()
    infile.readline()

    line = infile.readline()
    words = line.split()
    F = float(words[-1])

C = (F - 32) * 5 / 9
print(C)

"""
Terminal> python f2c_file_read.py
19.555555555555557
"""