var i, n, s: integer;begin readln(n); for i := 1 to n do begin if(i mod 2 = 0) then s := s + sqr(i); end; writeln(s);end.
var
i, n, s: integer;
begin
readln(n);
for i := 1 to n do begin
if(i mod 2 = 0) then s := s + sqr(i);
end;
writeln(s);
end.