var n,m,s:integer;
    p:0..100000000;
    f,g:text;
begin
assign(f,'fact.in');
assign(g,'fact.out');
reset(f);
read(f,p);
n:=5;
rewrite(g);
if p=0 then write(g,'1')
       else if (p-5) mod 6=0 then write(g,'-1')
                 else begin
                      s:=p div 5-1;
                      n:=(p-s)*5;
                      write(g,n);
                 end;
close(f);
close(g);
end.