int n;
cin >> n;
cout << (n - 1) / 3 << endl;
int m = (n - 1) / 6 * 6 + 2;
for (int i = 2; i < m; i += 6)
{
cout << i << ' ' << i + 2 << ' ' << i + 3 << endl;
cout << i + 1 << ' ' << i + 4 << ' ' << i + 5 << endl;
}
if ((n - 1) % 6 >= 3)
cout << m << ' ' << m + 1 << ' ' << m + 2 << endl;
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