#include<bits/stdc++.h>
using namespace std;
int a,b;
int main(){
	cin>>a;
	while(a!=1){
		if(a%2==0)a/=2;
		else a=a*3+1;
		b++;	
	}
	cout<<b;
}

python:

n = int(input())
c = 0
while True:
if n % 2 == 0:
n = n // 2
else:
n = n * 3 + 1
c += 1
if n == 1:
break
print(c)

c++

#include<stdio.h>
int main()
{
int n;
scanf("%d", &n);
int c = 0;
while (n != 1)
{
if (n % 2 == 1)
{
int sum = n * 3 + 1;
//printf("%d*3+1=%d\n", n,sum);
c++;
n = sum;
}
else
{
int div = n / 2;
//printf("%d/2=%d\n", n, div);
c++;
n = div;
}
}

printf("%d\n", c);
return 0;

}