Start: Nov, 12, 2017 10:00:00
2017秋Python程序设计基础培训第二次作业
End: Nov, 19, 2017 12:00:00
Time elapsed:
Time remaining:
Problem_ID: B
Result: Accepted
Time: 99ms
Memory: 24300kB
Author: wang1994abc
In contest: 1122 
n=int(input())
a=0
while n!=1:
    if n%2==0:
       n=1/2*n
    else:
       n=3*n+1
    a=a+1
print(a)