x = 0 #循环变量
ls = [] #创建列表
while x == 0:
shuru = input()
if shuru == '':
x = 1 #中断while
else:
ls.append(eval(shuru)) #增加元素
he = 0 #和
fangchahe = 0 #方差
zhongweishu = 0 #中位数
zhongweils = [] #排序后的列表
geshu = len(ls) #元素个数
for i in ls:
he += i
pingjun = he / geshu
for j in ls:
fangchahe += pow(2,j-pingjun) #方差 = ((各个元素与平均值的减)的平方)/元素个数
fangcha = fangchahe / geshu
zhongweils = sorted(ls) #sorted函数可以排序
midgeshu = len(zhongweils)
if midgeshu % 2 == 1:
zhongweishu = zhongweils[midgeshu//2]
else:
zhongweishu = (zhongweils[midgeshu//2]+zhongweils[midgeshu//2 - 1])//2
print(geshu,pingjun,'{0:.3}'.format(fangcha),zhongweishu)
print(zhongweils)