#include<stdio.h>
int main(){

    int n=0;
    scanf("%d",&n);
    int count =0;
    
    while(n!=1){
        
        if(n%2==0){
            n/=2;
            count++;
        }else{
            n=3*n+1;
            count++;
        }
    }
    printf("%d",count);
}