/in/foo.cc: In function 'int main()':
/in/foo.cc:5:20: error: 'in' was not declared in this scope
  int h,n,w,p,sum=0;in<<n<<h;
                    ^~
/in/foo.cc:11:3: error: 'summ' was not declared in this scope
   summ+=p;
   ^~~~
/in/foo.cc:5:14: warning: unused variable 'sum' [-Wunused-variable]
  int h,n,w,p,sum=0;in<<n<<h;
              ^~~