#!/usr/bin/python

import os
import time
import sys

#infile = os.environ['HOME']+"/data/in"
infile = "/tmp/in"
#outfile = os.environ['HOME']+"/data/out"
outfile = "/tmp/out"

def get(filename):
	if os.path.isfile(filename):
		return open(filename).read(1000)
	else:
		f = open(filename, 'a')
		f.write('0')
		f.close()
		return "0"

def put(filename, data):
	f = open(filename, 'w')
	f.write(data)
	f.close()


data = get("/proc/net/dev")

input_prev = get(infile)
output_prev = get(outfile)

def getbw():
	for line in data.split("\n"):
		if "wlan0" in line or "eth0" in line or "enp" in line:
			list = line.split()
			return (list[1], list[9])

input, output = getbw()

print (  str( round((float(input)-float(input_prev))/1024/10*8) ) + "/" + str( round((float(output)-float(output_prev))/1024/10*8) ) + "K"  )

if os.path.getmtime(infile) > time.time()-9.9:
	sys.exit()

put(infile, input)
put(outfile, output)