#平均年龄
# n = int(input())
# sum = 0
# for i in range(1,n+1):
#     sum += int(input())
#
# print("%.2f"%(sum/n))

#角谷猜想
# n = int(input())
# sum = 0
# while n!=1:
#     if n%2:
#         b=n*3+1
#         print(n,"*3+1",sep="")
#         n=b
#     else:
#         b=n//2
#         print(n,"/2=",b,sep="")
#         n=b
# print("end")