#include <iostream>
using namespace std;
int main() {
long long i, ile_stolikow, czapki_przy_stoliku;
cin >> ile_stolikow;
for (i = 1; i<=ile_stolikow; ++i)
cout << i << " ";
for (i = 1; i<=ile_stolikow; ++i)
cout << i << " ";
cin >> czapki_przy_stoliku;
cout << czapki_przy_stoliku;
return 0;
}
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