program rucsac;
var i, j, g, n, m : longint;
    w, p : array[1..5000] of integer;
    a : array[0..10000] of integer;
begin
  assign(input, 'rucsac.in');
  reset(input);
  read( n, g);
  for i:=1 to n do read( w[i], p[i]);
  a[0]:=0; m:=0;
  for i:=1 to n do  begin
   for j:=g downto w[i] do     begin
     if a[j-w[i]]+p[i]>a[j] then a[j]:=a[j-w[i]]+p[i];
                    if m<a[j] then m:=a[j];
                    end; end;
  assign(output, 'rucsac.out');
  rewrite(output);
  write(m);
end.