#include <stdio.h>

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