program C11;
{$APPTYPE CONSOLE}
var s,a,i,n:integer;
begin
writeln('Vvedit kilkist hodiv');
readln(n);
a:=5;s:=0;
for i:=1 to n do begin
S:=S+a;a:=2*a;end;
writeln(S);
readln;
end.