var f,g:text;
    i,j,n,nr:longint;
function cmmdc(a,b:longint):longint;
begin
while a<>b do
      if a>b then a:=a-b
             else b:=b-a;
cmmdc:=a;
end;

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
      if cmmdc(i,j)=1 then inc(nr);
write(g,nr);
close(f);
close(g);
end.