/in/foo.cc: In function 'int main()':
/in/foo.cc:5:15: error: 'INT_MXA' was not declared in this scope
  int n,a,maxa=INT_MXA,sum=1;
               ^~~~~~~
/in/foo.cc:10:3: error: 'sum' was not declared in this scope
   sum++;
   ^~~
/in/foo.cc:14:4: error: 'sum' was not declared in this scope
    sum=1;
    ^~~
/in/foo.cc:17:9: error: 'sum' was not declared in this scope
   cout<<sum<<<endl;
         ^~~
/in/foo.cc:17:14: error: expected primary-expression before '<' token
   cout<<sum<<<endl;
              ^