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 n=0;
		int cnt=1;
		int bo=1;
		while(b>0){
			b--;
			sc+=50*bo;
			if(cnt==100){
				n++;
				bo=(int) Math.pow(2, n);
				cnt=0;
			}
			cnt++;
		}
		while(a>0){
			a--;
			sc+=100*bo;
			if(cnt==100){
				n++;
				bo=(int) Math.pow(2, n);
				cnt=0;
			}
			cnt++;
		}
		if(d>=10){
			System.out.println("Impossible");
		}else{
			System.out.println("Possible");
			System.out.println(sc);
		}
	}
}