#!/usr/bin/env python

S = map(int,raw_input().split())
SL = len(S)

max = max(S)
min = min(S)
swma = 0
swmi = 1
for i in range(0,SL):
     if S[i] == max and swma == 0:
          S[i] = 0
          swma = 1
     if S[i] == min and swmi == 0:
          S[i] = 0
          swmi = 1

calc = 0
for i in range(0,SL):
          calc = calc + S[i]

calc2 = float(calc) / (SL - 2)
print '%0.2f' % calc2