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: 101ms
Memory: 24300kB
Author: cxf2017
In contest: 1122 
a=int(input())
i=0
while a>1:
    if a%2==0:
        a=a/2
        i=i+1
    else:
        a=a*3+1
        i=i+1
print(i)