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: a33221209
In contest: 1122 
a=int(input())
n=0
while a!=1 :
    if a % 2 ==0:
        a = a/2
    else:
        a = a*3+1
    n=n+1
print(n)