题解 | #xxx定律#

#include <iostream>

using namespace std;

int main()
{   int n,stepNmub=0;
    while(scanf("%d",&n)!=EOF){
            if(n==0) break;//0的情况
       while(n!=1){
            stepNmub++;
        if(n%2==0){
            n/=2;
        }
        else{//不能写n%2==1?
            n=(3*n+1)/2;
        }
      }
   printf("%d",stepNmub);

    }
}