#include <stdio.h>

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