杭電 hdu 3782

xxx定律：

#include<iostream>
using namespace std;
int main(){
    int n;
    while(cin>>n&&n){
        int count=0;
        while(n!=1){
            if(n%2==0)
                n/=2;
            else
                n=(3*n+1)/2;
            ++count;
        }
        cout<<count<<endl;
    }
    return 0;
}