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: 97ms
Memory: 24300kB
Author: lifeiying
In contest: 1122 
a=0
n=int(input())
while n!=1:
    if n%2==0:
        n=n/2
        a+=1
    else:
        n=n*3+1
        a+=1
print(a)