#!/usr/bin/env python
import datetime
import time
start_time = datetime.datetime.now()
fin = open("c:\inputs\in4_10.txt", "r")
s = fin.read()
fin.close()
fin = open( 'out_10_sec4_10.txt', "r" )
data_list = fin.readlines()
fin.close()
del data_list
data_list = ''
print data_list
fout = open("out_10_sec4_10.txt", "w")
fout.writelines(data_list)
fout.close()
c ='Contents of file input_fabo.txt'
vs = 'Your Value in file is = '
try:
    number = int(s)
except ValueError:
    number = 0
fout = open("out_10_sec4_10.txt", "a")
fout.write(c+'\n\n'+vs+s+'\n\n')
fout.close()
def si(n):
    sum=1
    k=1
    for i in range (1,n+1):
        i=i+1
        k=k*2
        sum=sum+k
    ads = 'Additions = '
    ls = str(i)
    fout = open("out_10_sec4_10.txt", "a")
    fout.write(ads+ls+'\n\n')
    fout.close()
    return sum

if __name__ == '__main__':
     si = str(si(number))
     ns = 'n = '
     rs = 'Result = '
     tis = 'Time Taken = '

ti = str(datetime.datetime.now() - start_time)
fout = open("out_10_sec4_10.txt", "a")
fout.write(ns + s +'\n\n'+ rs + si +'\n\n' +tis +ti)
fout.close()