var i, count: integer;
begin
count:= 0;
for i:=10 to 99 do
if i mod 10 = 0 then count = count + 1;
writeln(count);
end.
var i, count: integer;
begin
count:= 0;
for i:=10 to 99 do
if i mod 10 = 0 then count = count + 1;
writeln(count);
end.