program ex(f1,f2);
 type
  zn=array [1..1000] of integer;
 var
  a:zn; i,j,k,m,n,t:longint; f1,f2:text;
  flag:boolean;
 begin
  assign(f1,'hanoi.in'); reset(f1);
  assign(f2,'hanoi.out'); rewrite(f2);
  readln(f1,n);
  flag:=true;
  if n=1 then begin writeln(f2,2);  flag:=false; end;
  if n=2 then begin writeln(f2,6);  flag:=false; end;
  if n=3 then begin writeln(f2,14); flag:=false; end;
  if flag then
   begin
    t:=1; a[1]:=8;

    for i:=4 to n do
     begin
      for j:=1 to t do a[j]:=a[j]*2;
      for j:=1 to t do
       if a[j]>=10 then
        begin
         a[j+1]:=a[j+1]+(a[j] div 10);
         a[j]:=a[j] mod 10;
        end;
      if a[t+1]>0 then inc(t);
     end;

    dec(a[1]);
    for j:=1 to t do a[j]:=a[j]*2;
      for j:=1 to t do
       if a[j]>=10 then
        begin
         a[j+1]:=a[j+1]+(a[j] div 10);
         a[j]:=a[j] mod 10;
        end;
      if a[t+1]>0 then inc(t);

   for i:=1 to t do
   write(f2,a[t-i+1]);
   writeln(f2);
  end;
   close(f1);
   close(f2);
  end.