题解 | #xxx定律#

#include <bits/stdc++.h>

using namespace std;

int main(){

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

	return 0;
}