#include <stdio.h>

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

    }
    
    return 0;
}