var n,j,i,k,t:longint; a:array[1..100,1..100] of longint; begin readln(n); for k:=2 to n+1 do for i:=1 to n do for j:=1 to n do begin if (i+j)=k then begin inc(t);if k mod 2=0 then a[j,i]:=t else a[i,j]:=t; end; end; for i:=1 to n do begin for j:=1 to n do begin if (i+j)