#include<cstdio>
#include<iostream>
#include<cmath>
#include<cstring>
#include<string>
using namespace std;
int main()
{
int n,k=0;
scanf("%d",&n);
while(n!=1){
if(n%2==0)
n/=2;
else
n=(3*n+1)/2;
k++;
}
printf("%d\n",k);
return 0;
}
按照题目顺着写就行