var
Mas: array of real;
Count, i, k: Cardinal;
Sum: real;
begin
// ввод
Write('Длина массива?');
Readln(Count);
Setlength(Mas, Count);
For i := 0 to Count - 1 do
begin
Readln(Mas[i]);
end;
// Решение
Sum := 0;
k := 0;
For i := 0 to Count - 1 do
begin
If Mas[i] > 0 then
Sum := Sum + Mas[i];
Inc(k);
end;
Writeln('Kol-vo=', k);
Writeln('Sred. Arif.=', Sum / k);
end.