const nmax=20;
var a:array[1..nmax,1..nmax] of integer;
    n,i,j:byte;
begin
repeat
write('Ââåäèòå ðàçìåð ìàòðèöû îò 2 äî ',nmax,' n=');
readln(n);
until n in [2..nmax];
for i:=1 to n do
 begin
  for j:=1 to n do
   begin
    if odd(i) then a[i,j]:=(i-1)*n+j
    else a[i,j]:=(i-1)*n+n-j+1;
    write(a[i,j]:4);
   end;
  writeln;
 end;
end.