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: 107ms
Memory: 24300kB
Author: Amber
In contest: 1122 
step=0
n=int(input())
while n != 1:
    if n % 2 == 0:
        n=n//2
    else:
        n=n*3+1
    step+=1
print (step)