program gremlin;
uses crt;
var
s: array [1 .. 10] of integer;
r, n, i: integer;
begin
r := 0;
repeat
clrscr;
writeln('Введите количество элементов массива');
readln(n);
until n >= 6;
for i := 1 to n do
begin
readln(s[i]);
end;
if (s[3] > 0) and (s[6] > 0) then
begin
r := s[6] + s[3];
end;
writeln(r);
readln;
end.