include <bits/stdc++.h>

using namespace std;

int main() {

int n;
cin >> n;

for (int i = 2; i <= n - 2; i++) {

	bool f = true;

	for (int j = 2; j * j <= i; j++) {

		if (i % j == 0) {
			f = false;
			break;

		}
	}

	if (f == true) {
		for (int j = 2; j * j <= i + 2; j++) {

			if ((i + 2) % j == 0) {
				f = false;
				break;
			}
		}

		if (f == true) {
			cout << i << ' ' << i + 2 << endl;
		}
	}
}

return 0;

}