program multiplu;
var f,g:text;
    a,b,m:longint;


function cmmmc(a,b:longint):longint;
var cmmdc,a1,b1,r:longint;
begin
a1:=a;
b1:=b;
repeat
r:=a1 mod b1;
a1:=b1;
b1:=r;
until b1=0;
cmmdc:=a1;
cmmmc:=(a div cmmdc)*b;
end;

procedure  ialarand;
var ok:boolean;
    i,x,m1,m2:longint;
begin
m1:=cmmmc(a,b);
i:=0;
repeat
i:=i+1;
m2:=m1*i;
m:=m2;
repeat
x:=m2 mod 10;
ok:=false;
if (x=0) or (x=1) then
  begin
  ok:=true;
  m2:=m2 div 10
  end;
until (ok=false) or (m2=0);
until m2=0;
end;






begin
assign(f,'multiplu.in');
reset(f);
assign(g,'multiplu.out');
rewrite(g);
read(f,a,b);
ialarand;
write(g,m);
close(f);
close(g);
end.