#include <iostream>
#include <cmath>
using namespace std;

int main() {
	int A, B, C, D, ans = 0, i = 0;
	cin >> A >> B >> C >> D;
	if (D == 10) cout << "Impossible";
	else {
		while (B) {
			ans += (int)pow(2, i / 100) * 50;
			--B;
			++i;
		}
		while (A) {
			ans += (int)pow(2, i / 100) * 100;
			--A;
			++i;
		}
		cout << "Possible" << endl << ans;
	}
}