program pascal;
var a,b,n,i,j,nr:integer;
        f,g:text;

function cmmdc(a,b:integer):integer;
begin
while a<>b do
begin
if a>b then a:=a-b else
        b:=b-a;
end;
cmmdc:=a;
end;

begin
assign(f,'fractii.in');reset(f);
assign(g,'fractii.out');rewrite(g);
while not eof(f) do
readln(f,n);
nr:=0;
for i:=1 to n do
begin
for j:=1 to n do
if cmmdc(i,j)=1 then
inc(nr);
end;
writeln(g,nr);
close(f);close(g);
end.