/in/foo.cc: In function 'int main()':
/in/foo.cc:25:2: error: 'cin' was not declared in this scope
  cin>>n;
  ^~~
/in/foo.cc:25:2: note: suggested alternative:
In file included from /in/foo.cc:1:0:
/usr/include/c++/7/iostream:60:18: note:   'std::cin'
   extern istream cin;  /// Linked to standard input
                  ^~~
/in/foo.cc:28:2: error: 'cout' was not declared in this scope
  cout<<sum;
  ^~~~
/in/foo.cc:28:2: note: suggested alternative:
In file included from /in/foo.cc:1:0:
/usr/include/c++/7/iostream:61:18: note:   'std::cout'
   extern ostream cout;  /// Linked to standard output
                  ^~~~