#include <iostream>
using namespace std;
int main() {
    int n;
    while(cin>>n){
        int step=0;
        while(n!=1){
            if(n%2==0)n/=2;
            else n = (3*n+1)/2;
            step++;
        }
        cout<<step<<endl;
    }
}
// 64 位输出请用 printf("%lld")

PAT见过