//good->great->perfect->miss
#include <iostream>
#include <vector>
#define rep(i, n) for(i = 0; i < n; i++)
using namespace std;

int a, b, c, d;
vector<int> vec;

int main() {
	cin >> a >> b >> c >> d;
	
	if (d >= 10) { cout << "Impossible" << endl; return 0; }
	cout << "Possible" << endl;
	
	int i;
	rep(i, b) vec.push_back(50);
	rep(i, a) vec.push_back(100);
	
	int ans = 0;
	rep(i, vec.size()) {
		ans += vec[i] * (1 << (i / 100));
	}
	cout << ans << endl;
	return 0;
}