foo.cc: In function 'int main()':
foo.cc:6:1: error: 'cin' was not declared in this scope
    6 | cin>>x;
      | ^~~
foo.cc:2:1: note: 'std::cin' is defined in header '<iostream>'; did you forget to '#include <iostream>'?
    1 | #include <cmath>
  +++ |+#include <iostream>
    2 | using namespace std;
foo.cc:7:1: error: 'cout' was not declared in this scope
    7 | cout<<ceil(x/6.0);
      | ^~~~
foo.cc:7:1: note: 'std::cout' is defined in header '<iostream>'; did you forget to '#include <iostream>'?

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