/in/foo.cc: In function 'int main(int, char**)':
/in/foo.cc:5:2: error: 'Long' was not declared in this scope
  Long Long x,y,m,n,l;
  ^~~~
/in/foo.cc:6:7: error: 'x' was not declared in this scope
  cin>>x>>y;
       ^
/in/foo.cc:6:10: error: 'y' was not declared in this scope
  cin>>x>>y;
          ^
/in/foo.cc:12:2: error: expected '(' before 'return'
  return 0;
  ^~~~~~