Start: Apr, 17, 2017 10:00:00
Python程序设计基础培训第二次作业
End: Apr, 23, 2017 14:00:00
Time elapsed:
Time remaining:
Problem_ID: B
Result: Accepted
Time: 125ms
Memory: 21432kB
Author: 13666577021
In contest: 1086 
a=int(input())
s=0
while a!=1:
	if a%2==0:
		a=a//2
	else:
		a=a*3+1
	s=s+1
print s