#include <iostream>
#include <vector>
using namespace std;
int main(){
	int A, B, C, D;
	cin >> A >> B >> C >> D;
	if (D == 10){
		cout << "Impossible" << endl;
	} else {
		vector<int> s;
		for (int i = 0; i < B; i++){
			s.push_back(50);
		}
		for (int i = 0; i < A; i++){
			s.push_back(100);
		}
		int m = 1;
		int ans = 0;
		for (int i = 0; i < A + B; i++){
			ans += s[i] * m;
			if (i % 100 == 99){
				m *= 2;
			}
		}
		cout << "Possible" << endl;
		cout << ans<< endl;
	}
}