function cmmdc(a,b:longint):longint;
var r,d,aux:longint;
begin

cmmdc:=d;
end;
var n,i,j,nr,a,b,r:longint;
f,g:text;
begin
assign(f,'fractii.in');reset(f);
assign(g,'fractii.out');rewrite(g);
readln(f,n);
nr:=0;
for i:=1 to n do
  for j:=1 to n do begin
  a:=j;b:=i;
  r:=a mod b;
while r<>0 do begin
 a:=b;
 b:=r;
 r:=a mod b;
end;
  if b=1 then nr:=nr+1;
end;
write(nr);close(f);close(g);
end.