/in/foo.cc: In function 'int main()':
/in/foo.cc:10:6: warning: unused variable 'n' [-Wunused-variable]
  int n;
      ^
/in/foo.cc: In function 'bool IsPrime(long long int)':
/in/foo.cc:55:9: error: expected primary-expression before ')' token
   while()
         ^
/in/foo.cc:56:2: error: expected primary-expression before '}' token
  }
  ^