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Cod sursa(job #523548)
var n,i,j,k:longint; f:text;
function cmmdc(a,b:longint):longint;
begin
if b=0 then cmmdc:=a else
cmmdc:=cmmdc(b,a mod b);
end;
begin
assign(f,'fractii.in');
reset(f);
read(f,n);
close(f);
for i:=1 to n do
for j:=1 to n do
if cmmdc(i,j)=1 then inc(k);
assign(f,'fractii.out');
rewrite(f);
writeln(f,k);
close(f);
end.