#include <bits/stdc++.h>


using namespace std;

int main() {
	int n;
	cin >> n;
	vector<pair<int, int>>v10 = { {1,1},{4,2},{3,5},{2,8},{5,9},{6,6},{7,3},{10,4},{9,7},{8,10} };
	vector<pair<int, int>>v8 = { {1,1},{2,4},{3,7},{6,8},{5,5},{4,2},{7,3},{8,6} };
	vector<pair<int, int>>v7 = { {1,1},{2,4},{5,5},{6,2},{3,3},{4,6},{7,7} };
	vector<pair<int, int>>v6 = { {1,1},{2,4},{5,5},{6,2},{3,3},{4,6} };
	vector<pair<int, int>>v5 = { {1,3},{4,2},{5,5},{2,4},{3,1} };

	if (n == 5) {
		for (auto x : v6) {
			cout << x.first  << " " << x.second  << '\n';
		}
		return 0;
	}
	if (n == 12 || n == 13) {
		int cur = 0;
		for (auto x : v6) {
			cout << x.first + cur << " " << x.second + cur << '\n';
		}
		cur = 6;
		for (auto x : v6) {
			cout << x.first + cur << " " << x.second + cur << '\n';
		}
		cur = 12;
		if (n == 13) {
			cout << 13 << " " << 13 << '\n';
		}
		return 0;
	}

	for (int i = 0; i < 4; i++) {
		if (n < i * 10)break;
		int m = (n - i * 10) % 8;
		if (!m || m == 1 || m == 7 || m == 6) {
			cout << "POSSIBLE\n";
			int cur = 0;
			for (int j = 0; j < i; j++) {
				for (auto x : v10)cout << x.first + cur << " " << x.second + cur << '\n';
				cur += 10;
			}
			n -= 10 * i;
			int mm = n / 8;
			while (mm--) {
				for (auto x : v8) {
					cout << x.first + cur << " " << x.second + cur << '\n';
				}
				n -= 8;
				cur += 8;
			}
			if (m == 1) {
				cout << cur + 1 << " " << cur + 1 << '\n';
			}
			else if (m == 7) {
				for (auto x : v7) {
					cout << x.first + cur << " " << x.second + cur << '\n';
				}
			}
			else if (m == 6) {
				for (auto x : v6) {
					cout << x.first + cur << " " << x.second + cur << '\n';
				}
			}
			return 0;
		}
	}
	cout << "IMPOSSIBLE\n";
}