var v:array[1..1300100] of byte;
    n,i,j,s,k:longint;
begin
assign(input,'ciur.in'); reset(input);
assign(output,'ciur.out'); rewrite(output);
readln(n);k:=13*n;
 for i:=2 to trunc(sqrt(k)) do
  if v[i]=0 then for j:=2 to k div i do v[i*j]:=1;
 for i:=1 to n do s:=1-v[i];
close(input); close(output);
end.