#include<cstdio>

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