program SPIRAL;

{$APPTYPE CONSOLE}
var  m,n,k:integer;
begin
  assign(input,'SPIRAL.DAT');
  reset(input);
  readln(n,m);
  close(input);
  assign(output,'SPIRAL.SOL');
   rewrite(output);
   if (n<=m) then k:=(n-1)*2 else k:=(m-1)*2+1;
writeln(k);
close(output);
end.