/in/foo.cc:1:19: warning: extra tokens at end of #include directive
    1 | #include"iostream";
      |                   ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:4:24: warning: unused variable 'A' [-Wunused-variable]
    4 |         int L, S, T, M,A;
      |                        ^