Program BTT;
Uses crt;
Var A: array[1..1000] of longint;
n,i,s: longint;
Begin
Clrscr;
Write('Nhap n: '); Readln(n);
s:=0;
For i:=1 to n do
Begin
Write('A[',i,'] = '); Readln(A[i]);
If A[i] mod 2 = 0 then s:=s+A[i];
End;
Writeln('S = ',s);
For i:=1 to n do
If i mod 2 = 0 then Writeln(A[i]);
Readln
End.