/in/foo.cc: In function 'int main()':
/in/foo.cc:18:17: error: expected primary-expression before 'long'
   18 |         while(m-long long(m)!=0){
      |                 ^~~~
/in/foo.cc:18:17: error: expected ')' before 'long'
   18 |         while(m-long long(m)!=0){
      |              ~  ^~~~
      |                 )
/in/foo.cc:18:17: error: expected primary-expression before 'long'
   18 |         while(m-long long(m)!=0){
      |                 ^~~~