#!/usr/bin/env python
total=0
input_list=[]
input_number=None
#get list numbers
while input_number!="":
    input_number=raw_input()
    if input_number.isdigit()
     input_listoat(input_number))
#total list
for num in input_list:
    total+=num
#print average
print total/len(input_list)
