#include <bits/stdc++.h>
using namespace std;

int main() {
	int a, b, c, d;
	cin >> a >> b >> c >> d;
	if (d == 10) {
		cout << "Impossible" << endl;
		return 0;
	}
	cout << "Possible" << endl;
	int ans = 0; int k = a + b; int count = 1;
	while (k > 0) {
		int r = min(k, 100);
		ans += r * 100 * count; k -= r;
		int t = min(b, 100);
		ans -= t * 50 * count; b -= t;
		count *= 2;
	}
	cout << ans << endl;
	return 0;
}