#include <iostream> using namespace std; int main() { int n,res = 0; while(cin >> n) { while(n != 1) { if(n % 2 == 0) { n = n / 2; res++; } else { n = (3 * n + 1) / 2; res++; } } cout << res << endl; } return 0; } // 64 位输出请用 printf("%lld")