/in/foo.cc:1:1: error: 'import' does not name a type
    1 | import sys, math
      | ^~~~~~
/in/foo.cc:1:1: note: C++20 'import' only available with '-fmodules-ts'
/in/foo.cc:14:23: error: 'k' does not name a type
   14 |     n = int(data[0]); k = int(data[1])
      |                       ^
/in/foo.cc:18:17: error: 't' does not name a type
   18 |         u += 1; t //= 2
      |                 ^
/in/foo.cc:21:17: error: 't' does not name a type
   21 |         v += 1; t //= 5
      |                 ^