var sol,gam,i,j,k,m,n:longint;
    min,min1:real;

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

procedure solve;
  begin
    min:=n;
    if n=1 then
     begin
       writeln (1);
       halt;
     end;
    min1:=m;
    for i:=n to m do
      begin
        k:=i div 2;
        for j:=2 to k do
          if i mod j = 0 then
            gam:=gam+j;
        min:=gam/i;
        if min1>min then
          begin
            sol:=i;
            min1:=min;
          end;
        gam:=1;
      end;
  end;

procedure print;
  begin
    writeln (sol);
  end;

begin
  readdata;
  solve;
  print;
end.