#include <fstream>
#include <iostream>


int main() {

	//std::ifstream inf("Text.txt");	std::cin.rdbuf(inf.rdbuf());

	int A = 0, B = 0, C = 0, D = 0;
	std::cin >> A >> B >> C >> D;

	if (D >= 10) {
		std::cout << "Impossible" << std::endl;
		return 0;
	}

	int combo = 0;
	int score = 0;
	int rate = 1;

	for (int i = 0; i < B; i++) {
		score = score + 50 * rate;
		combo = combo + 1;
		if (combo % 100 == 0) {
			rate = rate * 2;
		}
	}

	for (int i = 0; i < A; i++) {
		score = score + 100 * rate;
		combo = combo + 1;
		if (combo % 100 == 0) {
			rate = rate * 2;
		}
	}

	std::cout << "Possible" << std::endl;
	std::cout << score << std::endl;

	return 0;

}