#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
using namespace std;

int main()
{
	int a,b,c,d;
	cin >> a >> b >> c >> d;
	if(d >= 10){
		cout << "Impossible\n";
		return 0;
	}
	int hantei[a+b];
	for(int i = 0; i < b; i++){
		hantei[i] = 50;
	}
	for(int i = b; i < a+b; i++){
		hantei[i] = 100;
	}

	for(int i = 100; i < a+b; i += 100){
		for(int j = i; j < a+b; j++){
			hantei[j] = hantei[j] * 2;
		}
	}

	int ans = 0;
	for(int i = 0; i < a+b; i++){
		ans += hantei[i];
	}

	cout << "Possible\n";
	cout << ans << "\n";

	return 0;
}