#include <bits/stdc++.h>
#define PI 3.14159265359
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 cnt = 0;
	int c_score = 0;
	//vector<char> v(A + B);
	for (int i = 1; i <= A+B; i++) {
		cnt++;
		int n = 1;
		if (cnt <= 100) {
			n = 1;
		}
		else {
			int x = cnt / 100;
			if (cnt % 100 == 0) x--;
			for (int j = 0; j < x; j++) {
				n *= 2;
			}
		}

		if (i <= B) {
			//v.at(i) = 'B';
			score += 50 * n;
		}
		else {
			//v.at(i) = 'A';
			score += 100 * n;
		}
	}

	cout << "Possible" << endl;
	cout << score << endl;
}