program mang;
uses crt;
var A:array [1..100] of integer;
n,i,d: byte;
Begin
clrscr;
write('Nhap so phan tu: '); readln(n);
for i:=1 to n do
begin
write('A[',i,']='); readln(A[i]);
if A[i] mod 3=0 then d:=d+1;
end;
writeln('a) Co ',d,' so chia het cho 3');
write('b) Day in nguoc: ');
for i:=n downto 1 do write(A[i],' ');
readln;
End.