#include "bits/stdc++.h"

using namespace std;

using ll = long long;
using ld = long double;

const double PI = 3.1415926535897932384626433832795;

const int dx[] = { 0, 1, 0, -1 };
const int dy[] = { -1, 0, 1, 0 };

int gcd(int x, int y) { return y ? gcd(y, x % y) : x; }
ll gcd(ll x, ll y) { return y ? gcd(y, x % y) : x; }
int lcm(int x, int y) { return x / gcd(x, y) * y; }
ll lcm(ll x, ll y) { return x / gcd(x, y) * y; }

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);

	ll a, b, c, d;
	cin >> a >> b >> c >> d;

	if (d * 100 >= 1000) {
		cout << "Impossible" << endl;
		return 0;
	}

	cout << "Possible" << endl;

	ll score = 0, cnt = 0, coeff = 1;
	for (ll i = 1; i <= b; i++) {
		cnt++;
		score += 50LL * coeff;
		if (cnt % 100 == 0) {
			coeff *= 2LL;
		}
	}

	for (ll i = 1; i <= a; i++) {
		cnt++;
		score += 100LL * coeff;
		if (cnt % 100 == 0) {
			coeff *= 2LL;
		}
	}

	cout << score << endl;
	return 0;
}