#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <cstdio>
#include <cstring>
#include <cmath>
using namespace std;
using ll = long long;

int main() {
    int a, b, c, d;
    cin >> a >> b >> c >> d;

    if (d < 10) {
        cout << "Possible" << endl;
        int s = 0, t = 0, u = 1;
        for (int i = 0; i < b; i++) {
            s += 50 * u;
            if (++t == 100) t -= 100, u *= 2;
        }
        for (int i = 0; i < a; i++) {
            s += 100 * u;
            if (++t == 100) t -= 100, u *= 2;
        }
        cout << s << endl;
    } else {
        cout << "Impossible" << endl;
    }

    return 0;
}