program ct;
uses crt;
var A:array[1..1000] of integer;
i,n,S:integer;
begin clrscr;
writeln('Nhap so phan tu: '); readln(n);
for i:=1 to n do
begin
writeln('Nhap phan tu thu ',i,': '); readln(A[i]);
end;
writeln('Cac so chan la: );
S:=0;
for i:=1 to n do
begin
if i mod 2=0 then writeln(A[i]:3);
if i mod 2<>0 then S:=S+i;
end;
writeln('Tong cac so le la: ',S);
readln;
end.
Học tốt!