type
  c=record
    d:longint;
    h:real;
end;

var sol,gam,i,j,k,l,m,n,b:longint;
    a:array [1..10000] of c;
    min:real;

procedure readdata;
  begin
    readln (n,m);
  end;

procedure check;
  begin
    if n=1 then
      begin
        writeln (0);
        halt;
      end;
  end;

procedure solve;
  begin
    for i:=n to m do
      begin
        k:=i div 2;
        for j:=1 to k do
          if i mod j = 0 then
            gam:=gam+j;
        inc (b);
        a[b].d:=i;
        a[b].h:=gam/i;
        gam:=0;
        if i>=m then
          break;
      end;
    min:=a[1].h;
    for i:=1 to b do
      if min>a[i].h then
        begin
          min:=a[i].h;
          sol:=a[i].d;
        end;
  end;

procedure print;
  begin
    writeln (sol);
  end;

begin
  readdata;
  check;
  solve;
  print;
end.