const
s = 20;{поменять на 100 для второй задачи}
var
days: integer;
distance, day_distance: real;
begin
days := 1;
day_distance := 10;
distance := day_distance;
repeat
day_distance := day_distance * 1.1;
distance := distance + day_distance;
days := days + 1;
until distance >= s;
writeln(days);
end.