{ http://infoarena.ro/problema/next }
var f,g:text;
    n,r,d:int64;
BEGIN
     assign(f,'next.in'); reset(f);
     assign(g,'next.out'); rewrite(g);
     readln(f,n);
     readln(f,d);
     r:=n mod d;
     write(g,n+(d-r) mod d);
     close(f); close(g);
END.