#include <iostream>
#include <algorithm>
#include <string>
#include <vector>
#include <map>
#include <set>
#include <stdio.h>
#include <cstring>
#include <queue>
#include <stack>
#include <functional>
#include <random>
using namespace std;
#define Would
#define you

int a, b, c, d;
int main() {
	cin >> a >> b >> c >> d;
	if (d >= 10) {
		cout << "Impossible" << endl;
		return 0;
	}

	cout << "Possible" << endl;
	int ans = 0, mon = a + b, cou = 1;
	while (mon > 0) {
		int n = min(mon, 100), m = min(b, 100);
		ans += n * 100 * cou;
		mon -= n;
		ans -= m * 50 * cou;
		b -= m;
		cou *= 2;
	}
	cout << ans << endl;
}