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Cod sursa(job #171381)
var f:text;
n,i,j,k:longint;
function cou(x,y:longint):longint;
begin
if x mod y=0 then cou:=y
else
cou:=cou(y,x mod y);
end;
begin
assign(f,'fractii.in');
reset(f);
readln(f,n);
close(f);
for i:=1 to n do
for j:=1 to n do
if cou(i,j)=1 then inc(k);
assign(f,'fractii.out');
rewrite(f);
writeln(f,k);
close(f);
end.