program bing;
var
 f1,f2:text;
 a:array[1..30000] of integer;
 i,j,s,w,n:integer;
procedure init;
begin
 assign(f1,'group.in');reset(f1);
 assign(f2,'group.out');rewrite(f2);
 readln(F1,w);
 readln(f1,n);
 for i:=1 to n  do read(f1,a[i]);
end;
procedure kuaipai(x,y:integer);
var
 i,j,t,tt:integer;
begin
 i:=x;j:=y;
 t:=a[(i+j)div 2];
 repeat
 while a[i]<t do inc(i);
 while a[j]>t do dec(j);
 if i<=j then
 begin
  tt:=a[i];
  a[i]:=a[j];
  a[j]:=tt;
  inc(i);
  dec(j);
 end;
 until i>j;
 if i<y then kuaipai(i,y);
 if j>x then kuaipai(x,j);
end;
begin
 init;
 kuaipai(1,n);
 i:=1;j:=n;s:=0;
 repeat
 if (a[j]+a[i]>w) then begin dec(j);inc(s);end
 else if a[j]+a[i]<=w then begin dec(j);inc(i);inc(s);end;
 until i>j;
 write(f2,s);
 close(f1);close(f2);
end.