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

#define repeat(i, x) for (int64_t i = 0; (i) < (int64_t)(x); (i)++)

namespace TaskB {
    void solve() {
        int a, b, c, d;
        cin >> a >> b >> c >> d;

        if (d == 10) {
            cout << "Impossible" << endl;
            return;
        }

        cout << "Possible" << endl;

        vector<int> scores;
        repeat (i, a) scores.push_back(100);
        repeat (i, b) scores.push_back(50);

        sort(scores.begin(), scores.end());

        int ans = 0,
            mag = 1;
        repeat (i, scores.size()) {
            if (i > 0 and i % 100 == 0) mag *= 2;
            ans += scores[i] * mag;
        }
        cout << ans << endl;
    }
}

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

    TaskB::solve();

    return 0;
}