import java.util.Scanner;

public class Main {

	@SuppressWarnings("resource")
	public static void main(String args[]) {
		Scanner scanner = new Scanner(System.in);
		int a=scanner.nextInt();
		int b=scanner.nextInt();
		int c=scanner.nextInt();
		int d=scanner.nextInt();
		int sc=0;
		int life=1000;
		int n=0;
		int bo=1;
		while(a>=100){
			a-=100;
			sc+=100*100*bo;
			n++;
			bo=(int) Math.pow(2, n);
		}
		sc+=a*100*bo;
		
		if(b>=100-a){
			b-=(100-a);
			sc+=(100-a)*50*bo;
			n++;
			bo=(int) Math.pow(2, n);
		}
		
		while(b>=100){
			b-=100;
			sc+=100*50*bo;
			n++;
			bo=(int) Math.pow(2, n);
		}
		sc+=b*50*bo;
		sc-=d*100;
		
		if(d>=10){
			System.out.println("Impossible");
		}else{
			System.out.println("Possible");
			System.out.println(sc);
		}
	}
}