#include <iostream>
#include <vector>
#include <map>
#include <set>
#include <queue>
#include <string>
#include <iomanip>
#include <algorithm>
#include <cmath>
#include <stdio.h>
using namespace std;
#define int long long
int MOD = 1000000007;
signed main() {
	cin.tie(0);
	ios::sync_with_stdio(false);
	int A, B, C, D;
	cin >> A >> B >> C >> D;
	if (D == 10) {
		cout << "Impossible" << endl;
	}
	else {
		cout << "Possible" << endl;
		int res = 0;
		int combo = 0;
		for (int i = 0; i < B; i++) {
			int bonus = (1 << (combo / 100));
			res += 50 * bonus;
			combo++;
		}
		for (int i = 0; i < A; i++) {
			int bonus = (1 << (combo / 100));
			res += 100 * bonus;
			combo++;
		}
		
		cout << res << endl;
	}
}