Вопрос 4

var
    a, num, i, count, marker: integer;
begin
    readln(num);
    a := num;
    i := 1;
    count := 0;
    while i <= 4 do
    begin
        marker := a mod 10;
        if marker mod 2 = 0 then count := count + 1;
        a := a div 10;
        i := i + 1;
    end;
writeln(count);
end.