import java.util.*;

class Main {
	static Scanner sc = new Scanner(System.in);
	public static void main(String[] args) {
		
		int a = sc.nextInt(); int b = sc.nextInt(); int c = sc.nextInt(); int d = sc.nextInt();
		if (d >= 10) System.out.println("Impossible");
		else {
			//AとBのみ
			int combo = 0;
			int score = 0;
			for (int i=0; i<b; i++) {
				score += Math.pow(2,combo/100)*50;
				combo++;
			}
			for (int i=0; i<a; i++) {
				score += Math.pow(2,combo/100)*100;
				combo++;
			}
			System.out.println("Possible");
			System.out.println(score);
		}
		
	}
}