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: 98ms
Memory: 24436kB
Author: lvkw
In contest: 1122 
s=int(input())
step=0
while s!=1:
    if s%2==0:
        s=s/2
    else:
        s=s*3+1
    step +=1
print(step)