#include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include using namespace std; #define REP(i,m,n) for(int i=(int)(m) ; i < (int) (n) ; ++i ) #define rep(i,n) REP(i,0,n) using ll = long long; const int inf=1e9+7; const ll longinf=1LL<<60 ; const ll mod=1e9+7 ; int main(){ ll n; cin>>n; int c = 0; ll ma = n; while(n!=1){ ++c; if(n%2){ n=3*n+1; ma = max(n,ma); } else n/=2; } cout<