T18_XXXdinglu.cpp

#include<bits/stdc++.h>
using namespace std;

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