var n,i,j,c:longint;
    f:text;

function cmmdc(a,b:longint):longint;
var r:longint;
begin
r:=a mod b;
while r<>0 do begin
a:=b;
b:=r;
r:=a mod b;
end;
cmmdc:=b;
end;

begin
c:=0;
assign(f, 'fractii.in');
reset(f);
readln(f, n);
for i:=1 to n do begin
for j:=1 to n do begin
if cmmdc(i, j) = 1 then begin
c:=c+1;
end;
end;
end;
close(f);
assign(f, 'fractii.out');
rewrite(f);
write(f, c);
close(f);
end.