program perechi;
var n,i,j,r,c,b,e:longint;
    a:array[1..1000]of integer;
    f,g:text;
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-1 do
  for j:=i+1 to n do
    begin
      b:=a[i];
      e:=a[j];
      while e<>0 do
        begin
          r:=b mod e;
          b:=e;
          e:=r;
        end;
      if b=1 then inc(c);
    end;
write(g,c);
close(f);
close(g);
end.