#include<iostream>
using namespace std;


int main() {
    int a,b,c,d;
    cin >> a; cin >> b; cin >> c; cin >> d; 
    if (d >= 10){
        cout << "Impossible\n";
        return 1;
    }
    
    cout << "Possible\n";
    
    int f = 1;
    long score = 0;

    while (b >= 100){
        score += 100 * 50 * f;
        b -= 100;
        f *= 2;
    }
    score += b * 50 * f;
    score += (100 - b) * 100 * f;
    a -= (100 - b);
    f *= 2;
    while (a >= 100){
        score += 100 * 100 * f;
        a-= 100;
        f *= 2;
    }
    score += a * 100 * f;

    cout << score << "\n";
}