program soultap(input,output);
type
 medc=record
  w,v,p:longint;
end;
var
 g:array[1..10]of integer;
 med:array[1..10,1..100]of medc;
 f:array[0..100,0..100]of longint;
 m,n,a,b:integer;
procedure ini;
var i,rt,js,zu,valu:longint;
begin
 assign(input,'soultap.in');assign(output,'soultap.out');
 reset(input);rewrite(output);
 readln(n,m,a,b);
 for i:=1 to 10 do g[i]:=0;
 for i:=1 to n do begin
  readln(rt,js,zu,valu);
  inc(g[zu]);
  med[zu,g[zu]].w:=rt;
  med[zu,g[zu]].v:=js;
  med[zu,g[zu]].p:=valu;
 end;
end;
procedure dp;
var i,k,j,l:integer;
begin
 for k:=1 to m do
  for j:=a downto 0 do
   for l:=b downto 0 do
    for i:=1 to g[k] do
     if (j-med[k,i].w>=0)and(l-med[k,i].v>=0)then
      if f[j-med[k,i].w,l-med[k,i].v]+med[k,i].p>f[j,l]
      then f[j,l]:=f[j-med[k,i].w,l-med[k,i].v]+med[k,i].p;
 write(f[a,b]);
 close(input);close(output);
end;
begin
 ini;
 dp;
end.