#include<iostream>
using namespace std;
int main() {
	int a, b, c, d;
	cin >> a >> b >> c >> d;
	if (d == 10) {
		cout << "Impossible" << endl;
		return 0;
	}
	int score = 0;
	int m = 1;
	int i = 0;
	for (; i < b; i++) {
		if (i % 100 == 0 && i != 0) m *= 2;
		score += 50 * m;
	}
	for (; i < a + b; i++) {
		if (i % 100 == 0 && i != 0) m *= 2;
		score += 100 * m;
	}
	cout << "Possible" << endl;
	cout << score << endl;
	return 0;
}