/in/foo.cc: In function 'int getprm(int)':
/in/foo.cc:781:6: warning: unused variable 'x' [-Wunused-variable]
  int x;
      ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:3121:7: warning: unused variable 'N' [-Wunused-variable]
   int N = getprm(MaxN);
       ^