uses crt;
var
n,k:longint;
begin
readln(n);
k:=1;
repeat
write(k,' ');
inc(k,2);
until k>=n;
if k=n then write(k,' ');
if k>n then k:=n
       else k:=k-1;
repeat
write(k,' ');
dec(k,2);
until k=0;
readln;
end.