program tickets(input,output);
var
 a:array[1..1000000]of integer;
 n,f,p:longint;
 ans,head,i,j,z:longint;

begin
 assign(input,'tickets.in');
 reset(input);
 readln(n,f);
 for i:=1 to n do read(a[i]);
 close(input);

 p:=0;
 head:=1;
 for i:=1 to n do
 begin
  if a[i]+p<=f then
  begin
   p:=p+a[i];
   inc(z);
   if z>ans then ans:=z;
  end
  else
  begin
   while (p+a[i]>f) do
   begin
    p:=p-a[head];
    inc(head);
    dec(z);
   end;
   p:=p+a[i];
   inc(z);
   if z>ans then ans:=z;
  end;
 end;

 assign(output,'tickets.out');
 rewrite(output);
 writeln(ans);
 close(output);
end.