/in/foo.cc:1:1: error: 'include' does not name a type; did you mean '__has_include'?
 include <iostream>
 ^~~~~~~
 __has_include
/in/foo.cc: In function 'int main()':
/in/foo.cc:7:2: error: 'cin' was not declared in this scope
  cin >> n
  ^~~
/in/foo.cc:7:2: note: suggested alternative: 'main'
  cin >> n
  ^~~
  main
/in/foo.cc:10:2: error: 'else' without a previous 'if'
  else
  ^~~~
/in/foo.cc:11:3: error: 'cout' was not declared in this scope
   cout << 4*n + 10;
   ^~~~