program r8_13;
uses crt;
const n=5;m=4;
var a:array[1..n,1..m] of integer;
x:array[1..m] of integer;
s:real;
k,i,j,g,min:integer;
BEGIN
clrscr;
randomize;
for i:=1 to n do begin
for j:=1 to m do begin
if i mod 2=1
then A[i,j]:=(i-1)*m+j
else A[i,j]:=i*m-j+1;
write(a[i,j]:4,' ');
end;
writeln;
end;
END.