program tongsochan;
uses crt;
var A:array[1..1000] of integer;
n,i,t:integer;
begin
clrscr;
write('Nhap so luong phan tu: ');
readln(n);
writeln('Nhap tung phan tu cua day:');
for i:=1 to n do
begin
write('Nhap A[',i,']: ');
readln(A[i]);
end;
t:=0;
for i:=1 to n do
if (i mod 2=1) and (A[i] mod 2=0) then
t:=t+A[i];
write('Tong: ',t);
readln
end.