import java.util.Scanner;

class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int A = sc.nextInt(), B = sc.nextInt(), C = sc.nextInt(), D = sc.nextInt(), ans = 0, i = 0;
		sc.close();
		if (D == 10) System.out.print("Impossible");
		else {
			while (B > 0) {
				ans += (int)Math.pow(2, i / 100) * 50;
				--B;
				++i;
			}
			while (A > 0) {
				ans += (int)Math.pow(2, i / 100) * 100;
				--A;
				++i;
			}
			System.out.print("Possible\n" + ans);
		}
	}
}