#include <iostream>
#define A 10
#define B 11

using namespace std;

inline void Print (const int x, const int y) {
	cout << x << ' ' << y << '\n';
}

inline void Work_5 (const int x) {
	Print (x + 2, x + 4);
	Print (x + 3, x + 1);
	Print (x + 0, x + 0);
	Print (x + 1, x + 3);
	Print (x + 4, x + 2);
}

inline void Work_6 (const int x) {
	Print (x + 0, x + 0);
	Print (x + 1, x + 3);
	Print (x + 4, x + 4);
	Print (x + 5, x + 1);
	Print (x + 2, x + 2);
	Print (x + 3, x + 5);
}

inline void Work_7 (const int x) {
	Print (x + 0, x + 0);
	Print (x + 1, x + 3);
	Print (x + 4, x + 4);
	Print (x + 5, x + 1);
	Print (x + 2, x + 2);
	Print (x + 3, x + 5);
	Print (x + 1, x + 1);
}

inline void Work_8 (const int x) {
	Print (x + 0, x + 0);
	Print (x + 1, x + 3);
	Print (x + 2, x + 6);
	Print (x + 5, x + 7);
	Print (x + 4, x + 4);
	Print (x + 3, x + 1);
	Print (x + 6, x + 2);
	Print (x + 7, x + 5);
}

inline void Work_9 (const int x) {
	Print (x + 0, x + 0);
	Print (x + 1, x + 3);
	Print (x + 2, x + 6);
	Print (x + 5, x + 7);
	Print (x + 4, x + 4);
	Print (x + 3, x + 1);
	Print (x + 6, x + 2);
	Print (x + 7, x + 5);
	Print (x + 8, x + 8);
} 

inline void Work_A (const int x) {
	Print (x + 0, x + 0);
	Print (x + 1, x + 3);
	Print (x + 2, x + 6);
	Print (x + 3, x + 9);
	Print (x + 6, x + 8);
	Print (x + 5, x + 5);
	Print (x + 4, x + 2);
	Print (x + 7, x + 1);
	Print (x + 8, x + 4);
	Print (x + 9, x + 7);
}

inline void Work_B (const int x) {
	Print (x + 0, x + 0);
	Print (x + 1, x + 3);
	Print (x + 2, x + 6);
	Print (x + 3, x + 9);
	Print (x + 6, x + 8);
	Print (x + 5, x + 5);
	Print (x + 4, x + 2);
	Print (x + 7, x + 1);
	Print (x + 8, x + 4);
	Print (x + 9, x + 7);
	Print (x + A, x + A);
}

int N, P = 1;

int main () {
	
	cin >> N;
	
	if (N == 1) return cout << "POSSIBLE" << endl << 1 << ' ' << 1 << endl, 0;
	if (N <= 4) return cout << "IMPOSSIBLE" << endl, 0;
	
	cout << "POSSIBLE" << endl;
	
	if (N == 5) return Work_5 (P), 0;
	
	while (N >= 12) Work_6 (P), P += 6, N -= 6;
	
	if (N == 6) Work_6 (P);
	if (N == 7) Work_7 (P);
	if (N == 8) Work_8 (P);
	if (N == 9) Work_9 (P);
	if (N == A) Work_A (P);
	if (N == B) Work_B (P);
	
	return 0;
}