import java.util.*;

public class Main {
	public static void main (String[] args) {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();
		int d = sc.nextInt();
		if (d >= 10) {
		    System.out.println("Impossible");
		    return;
		}
		System.out.println("Possible");
		int perfect = 100;
		int great = 50;
		long score = 0;
		while (a > 0 || b > 0) {
		    if (b > 100) {
		        score += Math.min(b, 100) * great;
		    } else {
		        score += b * great;
		        score += Math.min(a, 100 - b) * perfect;
		    }
		    b -= 100;
		    if (b < 0) {
		        a += b;
		        b = 0;
		    }
		    perfect *= 2;
		    great *= 2;
		}
		System.out.println(score);
   }
}