#include <iostream>

using namespace std;

int main() {
    int p, q;
    cin >> p >> q;

    if (p == 1) {
        cout << "Impossible" << endl;
        return 0;
    }

    cout << "Possible" << endl;

    int k = q / p;
    cout << 3 * k * (k + 1) << endl;
    int x = 0, y = 0;
    cout << x << " " << y << endl;

    for (int i = 0; i < k; i++) {
        for (int j = 0; j < k - i; j++) {
            cout << x << " " << --y << endl;
        }

        for (int j = 0; j < k - i; j++) {
            cout << ++x << " " << y << endl;
        }

        for (int j = 0; j < k - i; j++) {
            cout << x << " " << ++y << endl;
        }

        for (int j = 0; j < i + 1; j++) {
            cout << x << " " << ++y << endl;
        }

        for (int j = 0; j < i + 1; j++) {
            cout << ++x << " " << y << endl;
        }

        for (int j = 0; j < i + 1; j++) {
            cout << x << " " << --y << endl;
        }
    }

    return 0;
}