题解 | #xxx定律#

#include <iostream>
using namespace std;

int cal(int n){
    if(n == 1) return 0;
    int count = 0;
    label: if(n %2 == 0){
        n = n / 2;
    }else{
        n = 3*n + 1;
        n = n / 2;
    }
    count ++;
    
    if(n == 1) return count;
    else goto label;

}

int main() {
    int num;
    while(cin >> num){
        cout << cal(num) << endl;
    }
}