program rucsac;
type
tabel=array [0..50001] of longint;
var
t,v,tt:tabel;
i,j,s,n,m,nr:longint;
f1,f2:text;
function max(a,b:longint):longint;
begin
if a>b then max:=a else
max:=b;
end;
begin
assign (f1,'rucsac.in');
assign (f2,'rucsac.out');
reset (f1);
rewrite (f2);
readln (f1,n,m);
for i:=1 to n do
read (f1,t[i],v[i]);
for i:=1 to n do
for j:=m downto t[i] do
tt[j]:=max(tt[j],tt[j-t[i]]+v[i]);
write (f2,tt[m],' ');
close (f1);
close (f2);
end.