# Use the file name mbox-short.txt as the file name
fname = input("Enter file name: ")
fh = open(fname)
p = 0
for line in fh:
    if line.startswith("X-DSPAM-Confidence:") :
        p = 1 + p
      	z = line[20:28]
        y = z + z
mean = y / p
print(mean)

print("Done")