Main.c: In function 'main':
Main.c:14:13: warning: implicit declaration of function 'scanf_s'; did you mean 'scanf'? [-Wimplicit-function-declaration]
   14 |             scanf_s("%d", &a);
      |             ^~~~~~~
      |             scanf
Main.c:5:12: warning: unused variable 'b' [-Wunused-variable]
    5 |     int a, b, n;
      |            ^
/usr/lib/gcc/x86_64-alpine-linux-musl/12.2.1/../../../../x86_64-alpine-linux-musl/bin/ld: /tmp/ccHDooOD.o: in function `main':
Main.c:(.text.startup+0x6c): undefined reference to `scanf_s'
collect2: error: ld returned 1 exit status