/in/foo.cc: In function 'int main()':
/in/foo.cc:4:3: error: '__int64' was not declared in this scope
   __int64 x,y;
   ^~~~~~~
/in/foo.cc:5:10: error: 'x' was not declared in this scope
   cin >> x >> y;
          ^
/in/foo.cc:5:15: error: 'y' was not declared in this scope
   cin >> x >> y;
               ^