uses crt;
var n,i,dem:integer;
a:array[1..100]of integer;
begin
clrscr;
write('nhap n='); readln(n);
for i:=1 to n do
begin
write('a[',i,']='); readln(a[i]);
if a[i]=0 then exit
end;
dem:=0;
for i:=1 to n do
if a[i] mod 2=0 then inc(dem);
writeln('so luong so chan ban vua nhap vao la: ',dem);
readln;
end.