#include<stdio.h>

void main(){
    int n,c=0;
    scanf("%d",&n);

    while(n!=1){
        if(n%2==0){
            n=n/2;
        }else{
            n=n*3+1;
        }
        c++;
    }
    printf("%d",c);
}
/**************************************************************
	Problem: 1241
	User: admin
	Language: C
	Result: Accepted
	Time:10 ms
	Memory:1144 kb
****************************************************************/