/in/foo.cc:2:7: error: expected nested-name-specifier before 'namesapce'
 using namesapce std;
       ^~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:5:3: error: 'cin' was not declared in this scope
   cin>>a>>b;
   ^~~
/in/foo.cc:5:3: note: suggested alternative:
In file included from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:75:0,
                 from /in/foo.cc:1:
/usr/include/c++/6/iostream:60:18: note:   'std::cin'
   extern istream cin;  /// Linked to standard input
                  ^~~
/in/foo.cc:6:3: error: 'cout' was not declared in this scope
   cout<<a+b;
   ^~~~
/in/foo.cc:6:3: note: suggested alternative:
In file included from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:75:0,
                 from /in/foo.cc:1:
/usr/include/c++/6/iostream:61:18: note:   'std::cout'
   extern ostream cout;  /// Linked to standard output
                  ^~~~