var a:array[1..3,0..1005] of longint;
    c,e:array[1..5004] of longint;
    i,n,g,j:integer;
    f_in,f_out:text;

function max(x,y:longint):longint;
 begin
  if x>y then max:=x
         else max:=y;
 end;
begin
 assign(f_in,'rucsac.in');reset(f_in);
 assign(f_out,'rucsac.out');rewrite(f_out);
 readln(f_in,n,g);
 for i:=1 to n do readln(f_in,c[i],e[i]);

 for i:=1 to n do
  begin
   for j:=1 to g do
    begin
     a[2,j]:=a[1,j];
     if c[i]<=j then a[2,j]:=max(a[1,j],a[1,j-c[i]]+e[i]);
    end;

   for j:=1 to g do
     a[1,j]:=a[2,j];
  end;

 writeln(f_out,a[2,g]);

 close(f_in);
 close(f_out);
end.