#include <iostream>
using namespace std;
int A, B, C, D;
int main() {
	cin >> A >> B >> C >> D;
	int ret = 0;
	for (int i = 0; i < B; ++i) {
		ret += 50 << (i / 100);
	}
	for (int i = B; i < B + A; ++i) {
		ret += 100 << (i / 100);
	}
	if (D < 10) {
		cout << "Possible" << endl;
		cout << ret << endl;
	}
	else {
		cout << "Impossible" << endl;
	}
	return 0;
}