const
 n = 7;

var
 i, count: integer;
 prev, now: boolean;
 x: integer;
begin
 prev := false;
 count := 0;
 for i := 1 to n do
   begin
     readln(x);
     now := (x < 0);
     inc(count, byte(prev <> now));
     prev := now
   end;
 writeln('changes = ', count)
end.