foo.cc:12:20: error: expected ‘;’ before ‘int’
   12 | using namespace std
      |                    ^
      |                    ;
   13 | int main(){
      | ~~~                 
foo.cc: In function ‘int main()’:
foo.cc:14:28: warning: unused variable ‘tmp’ [-Wunused-variable]
   14 |         int birth,age,kind,tmp,price;
      |                            ^~~

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