var kancil, panda, i, j: integer;
begin
for i := 2 to 100 do
begin
j := 1;
kancil := 0;
while(j <= i) do
begin
if i mod j = 0 then inc(kancil);
inc(j);
end;
if kancil = 2 then inc(panda);
end;
writeln(panda);
end.
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