#include<iostream>
using namespace std;

int main() {
    int a, b, c, d;
    cin >> a >> b >> c >> d;
    int res = 0;
    int g_score = 50, p_score = 100;
    if (d == 10) res = -1;
    else {
        int conbo = 0;
        while(b) {
            if (b >= 100) {
                conbo += 100;
                res += g_score * 100;
                g_score *= 2;
                p_score *= 2;
                b -= 100;
            }
            else {
                conbo += b;
                res += g_score * b;
                break;
            }
        }
        for (int i = 0; i < a; i++) {
            conbo++;
            res += p_score;
            if (conbo % 100 == 0) p_score *= 2;
        }
    }
    if (res == -1) cout << "Impossible" << endl;
    else cout << "Possible" << endl << res << endl;
}