/in/foo.cc: In function 'int main(int, char**)':
/in/foo.cc:12:2: error: 'cin' was not declared in this scope
  cin>>n;
  ^~~
/in/foo.cc:15:3: error: 'cout' was not declared in this scope
   cout<<tim+1<<endl;
   ^~~~
/in/foo.cc:15:16: error: 'endl' was not declared in this scope
   cout<<tim+1<<endl;
                ^~~~
/in/foo.cc:17:3: error: 'cout' was not declared in this scope
   cout<<tim+2<<endl;
   ^~~~
/in/foo.cc:17:16: error: 'endl' was not declared in this scope
   cout<<tim+2<<endl;
                ^~~~