var f,g:text;
    n,d:qword;
begin
assign(f,'next.in');
assign(g,'next.out');
reset(f);
rewrite(g);
readln(f,n,d);
if n mod d=0 then writeln(g,n)
             else writeln(g,(n+d-(n mod d)));
close(f);
close(g);
end.