#include <stdio.h>

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