var f,g:text;
    i,j,n,nr:longint;
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,'fractii.in');reset(f);
assign(g,'fractii.out');rewrite(g);
read(f,n);
nr:=1;
for i:=2 to n do
for j:=1 to i-1 do
if cmmdc(i,j)=1 then
inc(nr);
writeln(g,nr);
close(f);close(g);
end.