uses crt;
var a: array[1..100] of integer;
n,i,s: integer;
begin
clrscr;
write ('nhap so phan tu: '); readln (n);
for i:=1 to do
begin
write ('nhap a[',i,']: '); readln (a[i]);
if (i mod 2=0) and (a[i] mod 2<>0) then s:=s+a[i];
end;
write ('mang nguoc la: ');
for i:=n downto 1 do write (a[i],' ');
writeln;
write ('cac so chia het cho 2 va 5 la: ');
for i:=1 to n do
if (a[i] mod 2=0) and (a[i] mod 5=0) then write (a[i],' ');
writeln ('tong cac phan tu le co chi so chan: ',s);
readln;
end.