#include "stdio.h"
using namespace std;
int main(){
    int n = 0;
    int count = 0;
    scanf("%d",&n);
    while (n!=1){
        count+=1;
        if(n%2==0){
            n=n/2;
        } else{
            n=n*3+1;
            n=n/2;
        }
    }
    printf("%d",count);
    return 0;
}