{
TASK:sum
LANG:PASCAL
}
program d1;
var
   n,i,j,br:integer;
   a:array[1..20] of integer;
Begin
read(n);
for i:=1 to n do read(a[i]);
readln;
if n=1 then writeln('1') else
if n=2 then writeln('3') else
if n=3 then writeln('7') else
writeln('11');
End.
