/in/foo.cc: In function 'int lcm(int, int)':
/in/foo.cc:18:7: warning: unused variable 'i' [-Wunused-variable]
  long i = 1;
       ^
/in/foo.cc:22:7: warning: variable 'a2' set but not used [-Wunused-but-set-variable]
  long a2 = 0;
       ^~