program perechi;
var n,i,j,c:longint;
    a:array[1..1000]of integer;
    f,g:text;

function cmmdc(a,b:longint):longint;
var r:longint;
begin
  while b<>0 do
    begin
      r:=a mod b;
      a:=b;
      b:=r;
    end;
  cmmdc:=a;
end;

begin
assign(f,'pairs.in');
reset(f);
assign(g,'pairs.out');
rewrite(g);
readln(f,n);
for i:=1 to n do readln(f,a[i]);
for i:=1 to n do
  for j:=i to n do
    if cmmdc(a[i],a[j])=1 then inc(c);
write(g,c);
close(f);
close(g);
end.