include

include

using namespace std;

bool is_prime(int x) {

if (x < 2) return false;
for (int i = 2; i * i <= x; ++i) {
    if (x % i == 0) return false;
}
return true;

}

int main() {

int n;
cin >> n;
for (int p = 2; p <= n - 2; ++p) {
    if (is_prime(p) && is_prime(p + 2)) {
        cout << p << " " << p + 2 << endl;
    }
}
return 0;

}