#include <stdio.h>

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