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Cod sursa(job #410994)
var a:array[1..1000000000] of 0..1;
f,g:text;
i,j,b,n,nr:longint;
begin
assign(f,'intrare.in'); reset(f);
assign(g,'iesire.out'); rewrite(g);
read(f,n);
for i:=2 to n do begin
for j:=2 to n do begin
b:=j*i;
a[b]:=1;
end; end;
for b:=1 to n do
if a[b]=0 then nr:=nr+1;
write(g,nr);
close(g);
close(f);
end.