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

int main() {
    int a, b, c, d;
    if (10 <= d) {
        cout << "Impossible" << endl;
        return 0;
    }
    cout << "Possible" << endl;
    int score = 0;
    for (int i = 0, p = 50; i < b; i++) {
        score += p;
        if (i % 100 == 0) {
            p *= 2;
        }
    }
    for (int i = 0, p = 100 * (1 << (b / 100)); i < a; i++) {
        score += p;
        if (i + b % 100 == 100) {
            p *= 2;
        }
    }
    score -= d * 100;
    cout << score << endl;
    return 0;
}