import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int A = sc.nextInt();
		int B = sc.nextInt();
		sc.nextInt();
		int D = sc.nextInt();
		sc.close();
		if(D == 10) {
			System.out.println("Impossible");
			System.exit(0);
		}
		System.out.println("Possible");
		int c = 0;
		int k = 1;
		int s = 0;
		for(int i = 0; i < B; i++) {
			s += 50 * k;
			c++;
			k = (int)Math.pow(2,c / 100);
		}
		for(int i = 0; i < A; i++) {
			s += 100 * k;
			c++;
			k = (int)Math.pow(2,c / 100);
		}
		System.out.println(s);
	}
}