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: 7890
In contest: 1122 
a = int(input())
n = 0
while a > 1:
    n += 1
    if a % 2 == 0:
        a /= 2
    else:
        a = a * 3 + 1
else:
    print(n)