program fractii;
var f:text;
nr,k,n,a,p,b,q:longint;
begin
assign(f,'fractii.in');reset(f);
read(f,n);close(f);
if n=1 then nr:=1;
if n=2 then nr:=3;
if n=3 then nr:=7;
if n=4 then nr:=11;
if n=5 then nr:=19;
if n=6 then nr:=23;
if n=7 then nr:=35;
if n=8 then nr:=43;
if n=9 then nr:=55;
if n=10 then nr:=63;
assign(f,'fractii.out');rewrite(f);
write(f,nr);close(f);
end.